Abstract: There are many factors that affect the lateral bearing capacity of wing-monopile, among which the number of wing plates, the angle between load direction and wing plates are the main influencing factors. The ABAQUS finite element calculation software was used to calculate the horizontal displacement of the pile at mud surface, tilt rate, internal force, stress and ultimate bearing capacity of 5 m diameter wing-monopile in the soft clay foundation with two, three and four symmetrical wing plates under different load directions. By comparing with the bearing characteristics of monopile under the same conditions, the extent of improvement of the lateral bearing capacity of the wing-monopile was analyzed, the mechanism for the wing plates to improve the lateral load-bearing performance by simultaneously or alternately bearing the end force, side frictional resistance, lateral earth pressure, and increasing the bending stiffness of the pile was clarified, the calculation formula of the lateral ultimate bearing capacity of wing-monopile with two, three and four symmetrical wing plates under load was proposed, and the control conditions of the ultimate bearing capacity of the wing-monopile were compared and analyzed.