Abstract: In the report, a crashworthy device with the combined steel shell and rubber structure for a 4 MW monopile offshore wind turbine（OWT） against ship collision was proposed. Based on the scale model test and the nonlinear FEM code LS-DYNA respectively, the dynamic characteristics of the OWT collided by the ship were investigated. According to corresponding international standards, the analysis of the collision between OWT and ship with or without the crashworthy device were performed and compared under typical cases. The results indicated that the new crashworthy device can effectively reduce the ship impact force on the OWT structure, and which can use the plastic deformation of its outer steel shell to absorb the impact energy, therefore, the tower structure of the OWT can be well protected. Additionally, the numerical results have a good agreement with the test data, the availability of the numerical model was verified.