According to the diversity of mobile power supply system,an general type excitation control system of synchronous generator by using STM32F103ZET as the control center is designed,the design of low remanence voltage exciting circuit,adapt to the different conditions of the excitation requirements of remanence;For the independent power system, the voltage and frequency fluctuation caused by the falling of the acquisition accuracy,the PLL circuit is introduced to realize the syschronous sampling,which can improve the accuracy of the acquisiyion;Using the control strategy of fuzzy PID based on parameter selftuning.The excitation voltage was controlled by power IGBT device.The experimental result indicated that it meets the requirements of equipment universal,and it has better dynamic,static performance, fast regulating speed,fully meet the requirements of the performance index.