diff --git a/modules/dnn/src/onnx/onnx_importer.cpp b/modules/dnn/src/onnx/onnx_importer.cpp
index 423bde5474..a548975642 100644
--- a/modules/dnn/src/onnx/onnx_importer.cpp
+++ b/modules/dnn/src/onnx/onnx_importer.cpp
@@ -1168,6 +1168,7 @@ void ONNXImporter::parseGlobalPool(LayerParams &layerParams, const opencv_onnx::
 
 void ONNXImporter::parseReduce(LayerParams& layerParams, const opencv_onnx::NodeProto& node_proto)
 {
+    layerParams.type = "Reduce";
     const auto& op_type = node_proto.op_type();
     String reduce_type;
     if (op_type == "ReduceMax")
@@ -1209,9 +1210,16 @@ void ONNXImporter::parseReduce(LayerParams& layerParams, const opencv_onnx::Node
         for (int i = 0; i < num_axes; ++i)
             axes[i] = mat_axes.at<int>(i);
         layerParams.set("axes", DictValue::arrayInt(&axes[0], num_axes));
+        if (constBlobs.find(node_proto.input(0)) != constBlobs.end()){
+            std::vector<Mat> inputs, output;
+            inputs.push_back(getBlob(node_proto, 0));
+            runLayer(layerParams, inputs, output);
+            CV_Assert(output.size() == 1);
+            addConstant(node_proto.output(0), output[0]);
+            return;
+        }
     }
 
-    layerParams.type = "Reduce";
     addLayer(layerParams, node_proto);
 }
 
diff --git a/modules/dnn/test/test_onnx_importer.cpp b/modules/dnn/test/test_onnx_importer.cpp
index f6d05464eb..743c19a5e6 100644
--- a/modules/dnn/test/test_onnx_importer.cpp
+++ b/modules/dnn/test/test_onnx_importer.cpp
@@ -1550,6 +1550,10 @@ TEST_P(Test_ONNX_layers, Einsum_const_inputs) {
     testONNXModels("einsum_const_inputs", npy, 0, 0, false, false, 1);
 }
 
+TEST_P(Test_ONNX_layers, ReduceSum_Consts){
+    testONNXModels("reducesum_consts");
+}
+
 TEST_P(Test_ONNX_layers, Pad2d_Unfused)
 {
     testONNXModels("ReflectionPad2d");