Abstract: With the increasing number of offshore wind farms construction and most of them are in the busy channel,the probability of collision of wind turbines by ships increased extensively. A fractal protection device was designed using the fractal theory in this paper.Based on the nonlinear dynamics theory,ANSYS/LS-DYNA was used to simulate the collision process between a 5000 t ship and a4 MW offshore wind turbine with different fractal order protection devices. The contact force,energy conversion,stress and collision depth were analyzed. The results show that the first,fractal protective devices can reduce the contact force by 3.93%,and can effectively extend the contact time compared with solid protective devices. In addition,the fractal structure can improve the internal energy conversion ability of the protective device,promote the energy absorption of the outer steel shell,and enhance the internal energy dissipation of rubber. Comparing with the solid one,the fractal protection device has a lower stress peak and a wider high stress zones,which can make more material play a protective role and effectively reduce the impact depth. The anti-collision performance of fractal structure of different order is related to the deformation of fractal hole after collision,and the first order fractal structure has the best protective performance.