diff --git a/build/plugin-recovery.html b/build/plugin-recovery.html
index 09692901..9e6f0578 100644
--- a/build/plugin-recovery.html
+++ b/build/plugin-recovery.html
@@ -464,7 +464,13 @@ <h1 id="heading"></h1>
         primary.disabled = true
         primary.textContent = model.primaryBusyLabel
         restart.disabled = true
-        navigate(model.canUninstall ? 'uninstall' : 'show-log')
+        if (model.canUninstall) {
+          navigate('uninstall')
+        } else if (model.canResetData) {
+          navigate('reset-data')
+        } else {
+          navigate('show-log')
+        }
       })
       restart.addEventListener('click', () => {
         restart.disabled = true
diff --git a/src/main/index.ts b/src/main/index.ts
index ac510712..fc5c109c 100644
--- a/src/main/index.ts
+++ b/src/main/index.ts
@@ -1,6 +1,7 @@
 import { spawn } from 'node:child_process'
 import { join } from 'node:path'
 import { appendFileSync, existsSync, readFileSync } from 'node:fs'
+import { mkdir, rename } from 'node:fs/promises'
 import { parse } from 'yaml'
 import {
   app,
@@ -51,13 +52,14 @@ import {
 import { buildPluginRecoveryViewModel } from './plugin-recovery-view'
 import { aboutDetail, bundledHarnessVersion } from './version-info'
 
-type PluginRecoveryAction = 'uninstall' | 'show-log' | 'quit' | 'restart' | 'refresh'
+type PluginRecoveryAction = 'uninstall' | 'show-log' | 'quit' | 'restart' | 'refresh' | 'reset-data'
 
 const PLUGIN_RECOVERY_ACTIONS = new Set<PluginRecoveryAction>([
   'uninstall',
   'show-log',
   'quit',
-  'restart'
+  'restart',
+  'reset-data'
 ])
 
 let mainWindow: BrowserWindow | undefined
@@ -637,6 +639,28 @@ function showUnexpectedError(error: unknown): void {
   dialog.showErrorBox('DSH Desktop encountered an error', message)
 }
 
+async function resetHarnessData(): Promise<boolean> {
+  const harnessHome = join(app.getPath('userData'), 'harness')
+  if (!existsSync(harnessHome)) {
+    await mkdir(harnessHome, { recursive: true })
+    return true
+  }
+
+  const timestamp = new Date().toISOString().replace(/[:.]/g, '-')
+  const backupPath = join(app.getPath('userData'), `harness-backup-${timestamp}`)
+
+  try {
+    await rename(harnessHome, backupPath)
+    await mkdir(harnessHome, { recursive: true })
+    return true
+  } catch (error) {
+    console.warn(
+      `[plugin-recovery] Failed to reset Harness data: ${error instanceof Error ? error.message : String(error)}`
+    )
+    return false
+  }
+}
+
 async function showPluginRecovery(options?: {
   message?: string
   logs?: readonly string[]
@@ -749,6 +773,22 @@ async function showPluginRecovery(options?: {
           return
         }
         continue
+      } else if (action === 'reset-data') {
+        const resetOk = await resetHarnessData()
+        if (!resetOk) {
+          notice = isChinese
+            ? '无法备份或重置 Harness 数据。请打开 Harness 日志查看详情，或手动重试。'
+            : 'The Harness data could not be backed up or reset. Open the Harness log for details or try again manually.'
+          continue
+        }
+        pluginRecoveryRemovedPlugins.length = 0
+        await launchHarness()
+        if (applyPendingFrontendEvidence()) continue
+        if (runtime.snapshot().phase === 'ready') {
+          schedulePluginRecoverySessionReset()
+          return
+        }
+        continue
       } else if (action === 'show-log') {
         shell.showItemInFolder(join(app.getPath('logs'), 'harness.log'))
         continue
diff --git a/src/main/plugin-recovery-view.ts b/src/main/plugin-recovery-view.ts
index d2b3bdb6..e67ca5b8 100644
--- a/src/main/plugin-recovery-view.ts
+++ b/src/main/plugin-recovery-view.ts
@@ -27,6 +27,11 @@ export interface PluginRecoveryViewModel {
   rawError: string
   quitLabel: string
   canUninstall: boolean
+  canResetData: boolean
+  resetLabel: string
+  resetBusyLabel: string
+  resetDetail: string
+  resetSafetyNote: string
 }
 
 interface FailureDescription {
@@ -167,7 +172,7 @@ export function buildPluginRecoveryViewModel(options: {
         : 'Harness 暂时无法启动',
       summary: canUninstall
         ? ''
-        : '目前还无法定位到具体插件。请打开 Harness 日志查看详细错误。',
+        : '目前还无法定位到具体插件。可以重置 Harness 数据（自动备份后重建）后再次启动，或打开日志查看详细错误。',
       reasonTitle: description.title,
       reasonDetail: description.detail,
       plugins,
@@ -179,8 +184,8 @@ export function buildPluginRecoveryViewModel(options: {
       safetyNote: '工作区、会话、模型配置和其他插件不会被删除。',
       primaryLabel: canUninstall
         ? multiple ? `卸载这 ${plugins.length} 个插件并继续检测` : '卸载此插件并继续检测'
-        : '打开 Harness 日志',
-      primaryBusyLabel: canUninstall ? '正在处理并重新检测…' : '正在打开日志…',
+        : '重置 Harness 数据',
+      primaryBusyLabel: canUninstall ? '正在处理并重新检测…' : '正在备份并重置…',
       restartLabel: '重启 Harness',
       restartBusyLabel: '正在重启…',
       logLabel: '打开 Harness 日志',
@@ -190,7 +195,12 @@ export function buildPluginRecoveryViewModel(options: {
       launchDirectory: snapshot.launchDirectory,
       rawError: snapshot.message,
       quitLabel: '退出 DSH Desktop',
-      canUninstall
+      canUninstall,
+      canResetData: !canUninstall,
+      resetLabel: '重置 Harness 数据',
+      resetBusyLabel: '正在备份并重置…',
+      resetDetail: '备份当前的 Harness 数据后重新创建一个干净的工作目录，再自动尝试启动。',
+      resetSafetyNote: '会先备份当前数据再清理；工作区和模型配置会被保留。'
     }
   }
 
@@ -203,7 +213,7 @@ export function buildPluginRecoveryViewModel(options: {
       : 'Harness could not start',
     summary: canUninstall
       ? ''
-      : 'No specific plugin could be identified. Open the Harness log to inspect the detailed error.',
+      : 'No specific plugin could be identified. Reset Harness data to back up the current directory and recreate a clean working folder, or open the log to inspect the detailed error.',
     reasonTitle: description.title,
     reasonDetail: description.detail,
     plugins,
@@ -215,8 +225,8 @@ export function buildPluginRecoveryViewModel(options: {
     safetyNote: 'Your workspaces, sessions, model settings, and other plugins will not be removed.',
     primaryLabel: canUninstall
       ? multiple ? `Remove these ${plugins.length} plugins and continue` : 'Remove this plugin and continue'
-      : 'Open Harness log',
-    primaryBusyLabel: canUninstall ? 'Removing and checking again…' : 'Opening log…',
+      : 'Reset Harness data',
+    primaryBusyLabel: canUninstall ? 'Removing and checking again…' : 'Backing up and resetting…',
     restartLabel: 'Restart Harness',
     restartBusyLabel: 'Restarting…',
     logLabel: 'Open Harness log',
@@ -226,6 +236,11 @@ export function buildPluginRecoveryViewModel(options: {
     launchDirectory: snapshot.launchDirectory,
     rawError: snapshot.message,
     quitLabel: 'Quit DSH Desktop',
-    canUninstall
+    canUninstall,
+    canResetData: !canUninstall,
+    resetLabel: 'Reset Harness data',
+    resetBusyLabel: 'Backing up and resetting…',
+    resetDetail: 'Back up the current Harness data and recreate a clean working folder, then retry startup automatically.',
+    resetSafetyNote: 'Backs up existing data first; your workspaces and model settings will be preserved.'
   }
 }
diff --git a/test/plugin-recovery-view.test.ts b/test/plugin-recovery-view.test.ts
index de272fd1..572af23f 100644
--- a/test/plugin-recovery-view.test.ts
+++ b/test/plugin-recovery-view.test.ts
@@ -85,7 +85,7 @@ describe('plugin recovery view model', () => {
     expect(model.canUninstall).toBe(true)
   })
 
-  it('falls back to the log when no plugin can be identified', () => {
+  it('falls back to resetting harness data when no plugin can be identified', () => {
     const model = buildPluginRecoveryViewModel({
       snapshot: failedSnapshot(),
       plugins: [],
@@ -93,8 +93,26 @@ describe('plugin recovery view model', () => {
       locale: 'en'
     })
     expect(model.canUninstall).toBe(false)
-    expect(model.primaryLabel).toBe('Open Harness log')
+    expect(model.canResetData).toBe(true)
+    expect(model.primaryLabel).toBe('Reset Harness data')
+    expect(model.primaryBusyLabel).toBe('Backing up and resetting…')
+    expect(model.resetLabel).toBe('Reset Harness data')
+    expect(model.resetDetail).toContain('Back up')
+    expect(model.resetSafetyNote).toContain('Backs up')
+    expect(model.logLabel).toBe('Open Harness log')
     expect(model.restartLabel).toBe('Restart Harness')
     expect(model.restartBusyLabel).toBe('Restarting…')
   })
+
+  it('hides the reset option when a removable plugin is identified', () => {
+    const model = buildPluginRecoveryViewModel({
+      snapshot: failedSnapshot(),
+      plugins: ['some-bad-plugin'],
+      removedPlugins: [],
+      locale: 'en'
+    })
+    expect(model.canUninstall).toBe(true)
+    expect(model.canResetData).toBe(false)
+    expect(model.primaryLabel).toBe('Remove this plugin and continue')
+  })
 })