diff --git a/providers/src/airflow/providers/celery/executors/default_celery.py b/providers/src/airflow/providers/celery/executors/default_celery.py
index 263791f89433c..616d2c0de9cc7 100644
--- a/providers/src/airflow/providers/celery/executors/default_celery.py
+++ b/providers/src/airflow/providers/celery/executors/default_celery.py
@@ -87,7 +87,7 @@ def _broker_supports_visibility_timeout(url):
     ),
     "worker_concurrency": conf.getint("celery", "WORKER_CONCURRENCY", fallback=16),
     "worker_enable_remote_control": conf.getboolean("celery", "worker_enable_remote_control", fallback=True),
-    **extra_celery_config,
+    **(extra_celery_config if isinstance(extra_celery_config, dict) else {}),
 }
 
 
diff --git a/providers/src/airflow/providers/celery/provider.yaml b/providers/src/airflow/providers/celery/provider.yaml
index a69dae610a935..5a45989804614 100644
--- a/providers/src/airflow/providers/celery/provider.yaml
+++ b/providers/src/airflow/providers/celery/provider.yaml
@@ -340,7 +340,7 @@ config:
         version_added: ~
         type: string
         example: ~
-        default: "{}"
+        default: "{{}}"
   celery_broker_transport_options:
     description: |
       This section is for specifying options which can be passed to the
diff --git a/providers/tests/celery/executors/test_celery_executor.py b/providers/tests/celery/executors/test_celery_executor.py
index ee69a094dc9f4..080bc9a898d69 100644
--- a/providers/tests/celery/executors/test_celery_executor.py
+++ b/providers/tests/celery/executors/test_celery_executor.py
@@ -407,4 +407,4 @@ def test_celery_extra_celery_config_loaded_from_string():
 
     # reload celery conf to apply the new config
     importlib.reload(default_celery)
-    assert default_celery.DEFAULT_CELERY_CONFIG["extra_celery_config"] == {"worker_max_tasks_per_child": 10}
+    assert default_celery.DEFAULT_CELERY_CONFIG["extra_celery_config"] == 10