In view of the maintenance requirements of offshore wind turbine generator set, a miniaturized wave compensation boarding trestle for offshore wind turbine maintenance vessel is designed. The general design, mechanical analysis, and software design of boarding trestle are made, and the finite element simulation of three-dimensional model of boarding trestle is made. The simulation results show that the design can meet the requirements of miniaturization and lightweight of offshore wind turbine maintenance vessel, and ensure the safety of personnel and materials and the stability of operation environment.