Abstract: In order to solve the problems of high-speed permanent magnet synchronous generator system with large output voltage fluctuation and long voltage recovery time when the load changes by the traditional control method, a voltage stabilizing control strategy of high speed permanent magnet synchronous generator based on double sliding mode controller is proposed. Firstly, the global sliding mode voltage controller is designed to eliminate the approach mode of the system and improve the attenuation function of the dynamic sliding mode surface, which improves the response speed and robustness of the system. At the same time, the approach law is improved and optimized in order to suppress the system chattering. Secondly, the disturbance sliding mode observer is designed to observe the load current and feedforward compensation to the global sliding mode voltage controller, which is combined with the dual sliding mode voltage controller to improve the anti-interference of the system. Finally, by building the corresponding simulation model and power generation experiment platform for simulation and experimental verification, the simulation and experimental results show that the proposed control strategy not only improves the voltage regulation performance of the system, but also effectively inhibits the steady-state voltage fluctuation and improves the dynamic voltage stability.