diff --git a/app/src/main/java/io/legado/app/data/dao/SearchBookDao.kt b/app/src/main/java/io/legado/app/data/dao/SearchBookDao.kt
index a2260b4f9..7afa40839 100644
--- a/app/src/main/java/io/legado/app/data/dao/SearchBookDao.kt
+++ b/app/src/main/java/io/legado/app/data/dao/SearchBookDao.kt
@@ -58,4 +58,6 @@ interface SearchBookDao {
     @Insert(onConflict = OnConflictStrategy.REPLACE)
     fun insert(vararg searchBook: SearchBook): List<Long>
 
+    @Query("delete from searchBooks where time < :time")
+    fun clearOld(time: Long)
 }
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/ui/main/MainActivity.kt b/app/src/main/java/io/legado/app/ui/main/MainActivity.kt
index ba125d7db..253507dc3 100644
--- a/app/src/main/java/io/legado/app/ui/main/MainActivity.kt
+++ b/app/src/main/java/io/legado/app/ui/main/MainActivity.kt
@@ -47,12 +47,19 @@ class MainActivity : VMBaseActivity<MainViewModel>(R.layout.activity_main),
         view_pager_main.addOnPageChangeListener(this)
         bottom_navigation_view.setOnNavigationItemSelectedListener(this)
         bottom_navigation_view.menu.findItem(R.id.menu_rss).isVisible = AppConfig.isShowRSS
+    }
+
+    override fun onPostCreate(savedInstanceState: Bundle?) {
+        super.onPostCreate(savedInstanceState)
         upVersion()
         if (AppConfig.autoRefreshBook) {
             view_pager_main.postDelayed({
                 viewModel.upChapterList()
             }, 1000)
         }
+        view_pager_main.postDelayed({
+            viewModel.clearDb()
+        }, 5000)
     }
 
     override fun onNavigationItemSelected(item: MenuItem): Boolean {
diff --git a/app/src/main/java/io/legado/app/ui/main/MainViewModel.kt b/app/src/main/java/io/legado/app/ui/main/MainViewModel.kt
index 4fe57d758..29fa339ea 100644
--- a/app/src/main/java/io/legado/app/ui/main/MainViewModel.kt
+++ b/app/src/main/java/io/legado/app/ui/main/MainViewModel.kt
@@ -13,6 +13,7 @@ import io.legado.app.utils.fromJsonObject
 import io.legado.app.utils.postEvent
 import kotlinx.coroutines.Dispatchers.IO
 import kotlinx.coroutines.delay
+import java.util.concurrent.TimeUnit
 
 class MainViewModel(application: Application) : BaseViewModel(application) {
     val updateList = hashSetOf<String>()
@@ -53,6 +54,12 @@ class MainViewModel(application: Application) : BaseViewModel(application) {
         }
     }
 
+    fun clearDb() {
+        execute {
+            App.db.searchBookDao().clearOld(System.currentTimeMillis() - TimeUnit.DAYS.toMillis(1))
+        }
+    }
+
     fun initRss() {
         execute {
             val url = "https://gitee.com/alanskycn/yuedu/raw/master/JS/RSS/rssSource"