Abstract: A three-dimensional numerical finite element model for shallow soil reinforcement of monopile offshore wind turbine foundation is established to analyze the effects of different ranges and shapes, as well as the cumulative deformation and dynamic response of monopile foundations under cyclic loads of different amplitudes and directions. The results provide optimization suggestions for the application of reinforcement in soil reinforcement around monopiles. The results show that under different reinforcement conditions, the first-order natural frequency of the wind turbine changes significantly; after reinforcement, compared with unreinforced monopile foundations, the displacement, rotation angle and internal force response under cyclic loads of monopiles are all reduced, and the displacement at mudline can be reduced by up to 81%; the shear stress and shear strain of the soil around the pile are also reduced.As the number of cycles increases, the increase in shear strain decreases and the plastic zone of the soil becomes smaller.