diff --git a/app/src/main/java/io/legado/app/help/AppWebDav.kt b/app/src/main/java/io/legado/app/help/AppWebDav.kt
index 41024e4c4..4b4422629 100644
--- a/app/src/main/java/io/legado/app/help/AppWebDav.kt
+++ b/app/src/main/java/io/legado/app/help/AppWebDav.kt
@@ -72,6 +72,7 @@ object AppWebDav {
                 WebDav(rootWebDavUrl, mAuthorization).makeAsDir()
                 WebDav(bookProgressUrl, mAuthorization).makeAsDir()
                 WebDav(exportsWebDavUrl, mAuthorization).makeAsDir()
+                WebDav(bgWebDavUrl, mAuthorization).makeAsDir()
                 val rootBooksUrl = "${rootWebDavUrl}books"
                 defaultBookWebDav = RemoteBookWebDav(rootBooksUrl, mAuthorization)
                 authorization = mAuthorization
@@ -159,7 +160,7 @@ object AppWebDav {
     /**
      * 获取云端所有背景名称
      */
-    suspend fun getAllBgWebDavFiles(): Result<List<WebDavFile>> {
+    private suspend fun getAllBgWebDavFiles(): Result<List<WebDavFile>> {
         return kotlin.runCatching {
             if (!NetworkUtils.isAvailable())
                 throw NoStackTraceException("网络未连接")
@@ -173,9 +174,18 @@ object AppWebDav {
     /**
      * 上传背景图片
      */
-    suspend fun upBgs(files: List<File>) {
+    suspend fun upBgs(files: Array<File>) {
         val authorization = authorization ?: return
         if (!NetworkUtils.isAvailable()) return
+        val bgWebDavFiles = getAllBgWebDavFiles().getOrThrow()
+            .map { it.displayName }
+            .toSet()
+        files.forEach {
+            if (!bgWebDavFiles.contains(it.name)) {
+                WebDav("$bgWebDavUrl${it.name}", authorization)
+                    .upload(it)
+            }
+        }
     }
 
     /**
diff --git a/app/src/main/java/io/legado/app/lib/webdav/WebDav.kt b/app/src/main/java/io/legado/app/lib/webdav/WebDav.kt
index eba7ead65..ef635e564 100644
--- a/app/src/main/java/io/legado/app/lib/webdav/WebDav.kt
+++ b/app/src/main/java/io/legado/app/lib/webdav/WebDav.kt
@@ -304,10 +304,17 @@ open class WebDav(
     suspend fun upload(
         localPath: String,
         contentType: String = "application/octet-stream"
+    ) {
+        upload(File(localPath), contentType)
+    }
+
+    @Throws(WebDavException::class)
+    suspend fun upload(
+        file: File,
+        contentType: String = "application/octet-stream"
     ) {
         kotlin.runCatching {
             withContext(IO) {
-                val file = File(localPath)
                 if (!file.exists()) throw WebDavException("文件不存在")
                 // 务必注意RequestBody不要嵌套，不然上传时内容可能会被追加多余的文件信息
                 val fileBody = file.asRequestBody(contentType.toMediaType())