diff --git a/packages/tree/src/tree.vue b/packages/tree/src/tree.vue
index 14f8dfb179..642406c9fe 100644
--- a/packages/tree/src/tree.vue
+++ b/packages/tree/src/tree.vue
@@ -181,7 +181,7 @@ export default defineComponent({
 
     watch(() => props.data, newVal => {
       store.value.setData(newVal)
-    })
+    }, { deep: true })
 
     watch(() => props.checkStrictly, newVal => {
       store.value.checkStrictly = newVal