The coastal areas where offshore wind power clustering is developing in China are severely affected by typhoon weather. For the maintenance of offshore wind turbines under the influence of typhoon weather, this paper proposes a preventive maintenance strategy for offshore wind turbines considering the influence of typhoon weather. Firstly, a component reliability model considering the dependence of component degradation status and typhoon impact is proposed, and then, a maintenance age regression model considering the 〖JP+2〗impact of typhoon impact is constructed to quantify the impact of typhoon impact on unit component degradation and maintenance. The maintenance efficiency is evaluated according to the service life regression model. With the lowest maintenance cost within life cycle of the unit as the goal, under the constraints of offshore accessibility time, maintenance mode, etc., a preventive maintenance model for offshore wind turbine units considering the impact of typhoon weather is established, and the variable maintenance threshold is optimized. The model is solved based on the improved multi-dimensional variable dichotomy. The simulation results show that the model proposed in this paper can effectively reduce the maintenance costs and fault losses of offshore wind turbines, and improve maintenance efficiency.