Abstract: In view of the typical section of Tianjin seawall, the physical model test of wave flume was carried out on the stability of the current seawall structure, the overtopping amount and the force of the wave retaining wall. The stability of the seawall under the action of storm surge and wave was verified, and the overtopping of the seawall and the force of the wave retaining wall were measured. The results show that: The current seawall has been destroyed by multiple waves and storm surges for about 20 years, resulting in aging of the material of the seawall and a decrease in the protection effect, which cannot meet the original design standards. Under design and extreme high water levels, the slope protection of the seawall has been severely damaged, and the overall structure has been greatly damaged or even overall instability. Under extreme water level, the maximum horizontal force of the retaining wall is 52.74 kN/m, and the maximum floating force at the bottom is 17.83 kN/m, the retaining wall has no observable slip or tilt, and the main structure is stable. Under extreme water level, the overtopping amount reaches 65.6 L/(m · s), the corresponding water tongue thickness is 0.91 m, and the overtopping distance is 14.36 m. In the test, there are also some waves directly crossing the retaining wall, and the overtopping amount, water tongue thickness and overtopping distance are greatly increased. The research results will provide scientific basis for subsequent embankment reinforcement and upgrading.