In order to investigate the economy of installing largediameter wedge shaped monopiles to support offshore wind turbines in shallow coastal waters. The Coupled EulerianLagrangian (CEL) approach is used to establish the finite element model of monopiles under highfrequency vibration load in ABAQUS, and the pile sinking characteristics of wedgeshaped monopile with the same amount of steel and monopile with the same section are compared and analyzed. By analyzing the four aspects of pile penetration speed, frictional resistance, soil displacement, and soil stress, this paper explores the influence of wedgeshaped structures on monopiles installation. The research results show that the total pile sinking time required for wedgeshaped monopiles in sandy soil is reduced by 38% compared to monopiles with equal crosssection, which has good economic benefits in construction; However, in the later stage of pile sinking, the peak displacement position of the shallow soil moves back, and the peak increment increases. The energy transmitted to the foundation is more intense, and the disturbance to the soil is more intense. The radial disturbance range of the surface increases by 0.01r. The research results not only provide a basis for the design of the cross section type of monopiles for offshore wind turbines in the future, but also provide an important reference for exploring the potential value of large diameter wedgeshaped monopile in offshore wind power projects.