diff --git a/astrbot/core/provider/manager.py b/astrbot/core/provider/manager.py
index ae4001fcd6..3b436356e0 100644
--- a/astrbot/core/provider/manager.py
+++ b/astrbot/core/provider/manager.py
@@ -813,6 +813,24 @@ async def terminate_provider(self, provider_id: str) -> None:
             )
             del self.inst_map[provider_id]
 
+    @staticmethod
+    def _sync_fallback_chat_models(
+        config: dict, old_id: str, new_id: str | None = None
+    ) -> None:
+        """Remove or remap a provider id in fallback_chat_models after delete/rename."""
+        provider_settings = config.get("provider_settings")
+        if not isinstance(provider_settings, dict):
+            return
+        fallback_ids = provider_settings.get("fallback_chat_models")
+        if not isinstance(fallback_ids, list) or old_id not in fallback_ids:
+            return
+        updated_ids = []
+        for fallback_id in fallback_ids:
+            mapped_id = new_id if fallback_id == old_id else fallback_id
+            if mapped_id is not None and mapped_id not in updated_ids:
+                updated_ids.append(mapped_id)
+        provider_settings["fallback_chat_models"] = updated_ids
+
     async def delete_provider(
         self, provider_id: str | None = None, provider_source_id: str | None = None
     ) -> None:
@@ -832,6 +850,7 @@ async def delete_provider(
                 config["provider"] = [
                     prov for prov in config["provider"] if prov.get("id") != tpid
                 ]
+                self._sync_fallback_chat_models(config, tpid)
             config.save_config()
             logger.info(f"Provider {target_prov_ids} 已从配置中删除。")
 
@@ -855,6 +874,8 @@ async def update_provider(self, origin_provider_id: str, new_config: dict) -> No
                     break
             else:
                 raise ValueError(f"Provider ID {origin_provider_id} not found")
+            if npid != origin_provider_id:
+                self._sync_fallback_chat_models(config, origin_provider_id, npid)
             config.save_config()
             # reload instance
             await self.reload(new_config)
diff --git a/tests/unit/test_provider_manager_fallback_sync.py b/tests/unit/test_provider_manager_fallback_sync.py
new file mode 100644
index 0000000000..a87b8fc7f9
--- /dev/null
+++ b/tests/unit/test_provider_manager_fallback_sync.py
@@ -0,0 +1,130 @@
+import asyncio
+from types import SimpleNamespace
+
+import pytest
+
+import astrbot.core.star.context  # noqa: F401  # 先导入以规避 provider.manager 的循环导入
+from astrbot.core.provider.manager import ProviderManager
+
+
+class FakeConfig(dict):
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.save_count = 0
+
+    def save_config(self):
+        self.save_count += 1
+
+
+def _build_manager(config: FakeConfig) -> ProviderManager:
+    manager = ProviderManager.__new__(ProviderManager)
+    manager.resource_lock = asyncio.Lock()
+    manager.acm = SimpleNamespace(default_conf=config)
+    manager.providers_config = config["provider"]
+    return manager
+
+
+async def _noop_terminate(provider_id: str) -> None:
+    del provider_id
+
+
+@pytest.mark.asyncio
+async def test_delete_provider_removes_fallback_reference():
+    config = FakeConfig(
+        {
+            "provider": [{"id": "p1"}, {"id": "p2"}],
+            "provider_settings": {"fallback_chat_models": ["p1", "p2"]},
+        }
+    )
+    manager = _build_manager(config)
+    manager.terminate_provider = _noop_terminate
+
+    await manager.delete_provider(provider_id="p1")
+
+    assert config["provider"] == [{"id": "p2"}]
+    assert config["provider_settings"]["fallback_chat_models"] == ["p2"]
+    assert config.save_count == 1
+
+
+@pytest.mark.asyncio
+async def test_delete_provider_source_removes_all_fallback_references():
+    config = FakeConfig(
+        {
+            "provider": [
+                {"id": "p1", "provider_source_id": "src"},
+                {"id": "p2", "provider_source_id": "src"},
+                {"id": "p3"},
+            ],
+            "provider_settings": {"fallback_chat_models": ["p1", "p2", "p3"]},
+        }
+    )
+    manager = _build_manager(config)
+    manager.terminate_provider = _noop_terminate
+
+    await manager.delete_provider(provider_source_id="src")
+
+    assert config["provider"] == [{"id": "p3"}]
+    assert config["provider_settings"]["fallback_chat_models"] == ["p3"]
+
+
+@pytest.mark.asyncio
+async def test_update_provider_renames_fallback_reference():
+    config = FakeConfig(
+        {
+            "provider": [{"id": "p1", "enable": True}],
+            "provider_settings": {"fallback_chat_models": ["p1", "p3"]},
+        }
+    )
+    manager = _build_manager(config)
+    reloaded = []
+
+    async def _record_reload(new_config: dict) -> None:
+        reloaded.append(new_config)
+
+    manager.reload = _record_reload
+
+    await manager.update_provider("p1", {"id": "p1-renamed", "enable": True})
+
+    assert config["provider_settings"]["fallback_chat_models"] == ["p1-renamed", "p3"]
+    assert reloaded and reloaded[0]["id"] == "p1-renamed"
+
+
+@pytest.mark.asyncio
+async def test_update_provider_rename_dedupes_stale_target():
+    # "p2" 是残留在回退列表里的失效 ID；把 p1 改名为 p2 后不应产生重复项
+    config = FakeConfig(
+        {
+            "provider": [{"id": "p1", "enable": True}],
+            "provider_settings": {"fallback_chat_models": ["p1", "p2"]},
+        }
+    )
+    manager = _build_manager(config)
+
+    async def _record_reload(new_config: dict) -> None:
+        del new_config
+
+    manager.reload = _record_reload
+
+    await manager.update_provider("p1", {"id": "p2", "enable": True})
+
+    assert config["provider_settings"]["fallback_chat_models"] == ["p2"]
+
+
+@pytest.mark.asyncio
+async def test_update_provider_same_id_keeps_fallback_list():
+    config = FakeConfig(
+        {
+            "provider": [{"id": "p1", "enable": True}],
+            "provider_settings": {"fallback_chat_models": ["p1"]},
+        }
+    )
+    manager = _build_manager(config)
+
+    async def _record_reload(new_config: dict) -> None:
+        del new_config
+
+    manager.reload = _record_reload
+
+    await manager.update_provider("p1", {"id": "p1", "enable": False})
+
+    assert config["provider_settings"]["fallback_chat_models"] == ["p1"]