In order to reduce the adverse effect of negative torque on the wind turbine efficiency, a kind of wind turbine with vertical shaft resistance and right-angle paddle function was proposed. Through theoretical analysis and calculation, a prediction model of wind turbine efficiency coefficient was established, and the optimal tip velocity ratio and maximum efficiency were obtained. Using the numerical simulation software, the transient simulation operation of the wind turbine was carried out by using the dynamic grid method, and the changes of flow field and aerodynamic parameters during the operation of the wind turbine were analyzed. The simulation results show that the efficiency of wind turbine is the highest when the tip velocity ratio is around 026, and the highest efficiency can reach 028. The simulation results basically accord with the calculation results of the theoretical prediction model.