diff --git a/backend/src/module/conf/search_provider.py b/backend/src/module/conf/search_provider.py
index 04e0c860..7a63eda4 100644
--- a/backend/src/module/conf/search_provider.py
+++ b/backend/src/module/conf/search_provider.py
@@ -18,6 +18,7 @@ def _default_parser(site: str) -> str:
 
 DEFAULT_PROVIDER: dict[str, ProviderConfig] = {
     "mikan": {"url": "https://mikanani.me/RSS/Search?searchstr=%s", "parser": "mikan"},
+    "anibt": {"url": "https://anibt.net/rss/magnets.xml?q=%s", "parser": "tmdb"},
     "nyaa": {"url": "https://nyaa.si/?page=rss&q=%s&c=0_0&f=0", "parser": "tmdb"},
     "dmhy": {"url": "http://dmhy.org/topics/rss/rss.xml?keyword=%s", "parser": "tmdb"},
 }
@@ -41,7 +42,12 @@ def _normalize(raw: dict) -> dict[str, ProviderConfig]:
 
 def load_provider() -> dict[str, ProviderConfig]:
     if PROVIDER_PATH.exists():
-        return _normalize(json_config.load(PROVIDER_PATH))
+        providers = _normalize(json_config.load(PROVIDER_PATH))
+        # 旧配置文件可能缺少后来新增的内置搜索源（如 anibt）：补齐缺失项，
+        # 用户对已有站点的自定义 URL / 解析器保持不变。
+        for site, config in DEFAULT_PROVIDER.items():
+            providers.setdefault(site, config)
+        return providers
     else:
         PROVIDER_PATH.parent.mkdir(parents=True, exist_ok=True)
         json_config.save(PROVIDER_PATH, DEFAULT_PROVIDER)
diff --git a/backend/src/test/test_search_provider.py b/backend/src/test/test_search_provider.py
index 14c8df5e..3fe59661 100644
--- a/backend/src/test/test_search_provider.py
+++ b/backend/src/test/test_search_provider.py
@@ -49,6 +49,14 @@ class TestNormalize:
         assert result["custom"]["parser"] == "tmdb"
 
 
+class TestDefaultProvider:
+    def test_default_provider_includes_anibt_with_tmdb_parser(self):
+        """anibt is a built-in default provider searched via its RSS feed."""
+        anibt = search_provider_module.DEFAULT_PROVIDER["anibt"]
+        assert anibt["url"] == "https://anibt.net/rss/magnets.xml?q=%s"
+        assert anibt["parser"] == "tmdb"
+
+
 class TestLoadProvider:
     def test_load_provider_backward_compatible_with_legacy_file(
         self, tmp_path, monkeypatch
@@ -74,6 +82,22 @@ class TestLoadProvider:
         assert result == search_provider_module.DEFAULT_PROVIDER
         assert search_provider_module.PROVIDER_PATH.exists()
 
+    def test_load_provider_merges_new_default_sites_into_saved_config(self):
+        """A saved config that predates a newly added built-in provider gains
+        that provider on load, while user-customized entries are kept as-is."""
+        from module.utils import json_config
+
+        json_config.save(
+            search_provider_module.PROVIDER_PATH,
+            {"mikan": {"url": "https://my.mirror/RSS/Search?searchstr=%s"}},
+        )
+
+        result = load_provider()
+
+        assert result["mikan"]["url"] == "https://my.mirror/RSS/Search?searchstr=%s"
+        assert result["anibt"] == search_provider_module.DEFAULT_PROVIDER["anibt"]
+        assert result["nyaa"] == search_provider_module.DEFAULT_PROVIDER["nyaa"]
+
 
 class TestSaveProvider:
     def test_save_provider_stores_url_and_parser(self):
diff --git a/webui/src/components/setting/config-search-provider.vue b/webui/src/components/setting/config-search-provider.vue
index b4fd0986..f21a330c 100644
--- a/webui/src/components/setting/config-search-provider.vue
+++ b/webui/src/components/setting/config-search-provider.vue
@@ -85,7 +85,7 @@ const canAdd = computed(
 );
 
 // Default providers that cannot be deleted
-const defaultProviderNames = ['mikan', 'nyaa', 'dmhy'];
+const defaultProviderNames = ['mikan', 'anibt', 'nyaa', 'dmhy'];
 
 onMounted(() => {
   loadProviders();
diff --git a/webui/src/store/search.ts b/webui/src/store/search.ts
index 7017047f..5d4b5cab 100644
--- a/webui/src/store/search.ts
+++ b/webui/src/store/search.ts
@@ -25,7 +25,7 @@ export interface GroupedBangumi {
 }
 
 export const useSearchStore = defineStore('search', () => {
-  const providers = ref<string[]>(['mikan', 'dmhy', 'nyaa']);
+  const providers = ref<string[]>(['mikan', 'anibt', 'dmhy', 'nyaa']);
 
   const {
     keyword,