The utility model relates to a hydraulic engineering technical field especially relates to expansion joint stagnant water technical field, specifically discloses an expansion joint stagnant water structure, including be used for striding the expansion joint pre -buried in the concrete member bottom metal stagnant water piece and be located metal stagnant water piece upstream face one side silt thewell up, metal stagnant water piece be equipped with with the compromise joint that match at the expansion joint, compromise joint includes that at least two the nose forms that cross are protruding,the material of silting the well up is selected from the plasticity clay, just silt up the well cover in the prominent intersection of nose form. The utility model discloses expansion joint stagnantwater structure can show the reliability that improves the stagnant water, prevents to lead to leaking because of metal stagnant water compromise joint tears.