The liquefaction of ground is one of the main reasons for the destruction of the wharf structure under seismic action. A two-dimensional finite element numerical model is established for a type of 200, 000-tonnage sheet-pile wharf with relieving platform, and the effective stress method is applied to analyze the dynamic time-history of the wharf structure, its force and deformation in liquefiable ground and the dynamic response of the surrounding soil are analyzed in details. The results are summarized as following:in the liquefiable ground, the deformation of the front wall of the new type of sheet-pile wharf is different from that of the traditional single anchored flexible retaining wall, and there is no obvious bulging deformation. The bending moment of the front wall is the largest in the seismic action, and the maximum bending moment is located near the sea floor. The structure of the wharf has magnified effect on the seismic response of the surrounding soil, and the influence of the empty face on the PGA decreases with the increase of the earthquake intensity. The soil liquefaction range increases with the increase of ground motion intensity, and there is a risk of overall slip in the case of 0. 50g.