diff --git a/CHANGELOG.md b/CHANGELOG.md
index e7049a4eb2d752013c8768d8f216ef6649a9905c..f6e7a7855dbde183117c8ab86288a5d25542ecaa 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,7 @@ Please mark all change in change log and use the issue from GitHub
 ## Bug
 -   \#1705 Limit the insert data batch size
 -   \#1776 Error out when index SQ8H run in CPU mode
+-   \#1925 To flush all collections, flush cannot work
 -   \#1929 Skip MySQL meta schema field width check
 -   \#1946 Fix load index file CPU2GPU fail during searching
 -   \#1955 Switch create_index operation to background once client break connection
diff --git a/core/src/server/delivery/request/FlushRequest.cpp b/core/src/server/delivery/request/FlushRequest.cpp
index 2f0fd7c6ef771f5caa8e744300b0d552d6aac630..f8bec5effa95a05534edcd5a50319a4cd2da51a2 100644
--- a/core/src/server/delivery/request/FlushRequest.cpp
+++ b/core/src/server/delivery/request/FlushRequest.cpp
@@ -49,6 +49,13 @@ FlushRequest::OnExecute() {
     Status status = Status::OK();
     LOG_SERVER_DEBUG_ << hdr;
 
+    // flush all collections
+    if (collection_names_.empty()) {
+        status = DBWrapper::DB()->Flush();
+        return status;
+    }
+
+    // flush specified collections
     for (auto& name : collection_names_) {
         // only process root collection, ignore partition collection
         engine::meta::CollectionSchema collection_schema;