The in-pipe intelligent plugging tool is widely used in pipeline repair and maintenance.The speed regulating device moving speed in the pipeline can be adjusted by using the changed pressure difference between the front and back of the intelligent plugging tool.As the energy of the intelligent plugging tool is provided by battery packs,its working time is affected by the storage limit of the battery packs.Therefore, a speed regulation and energy saving device with accumulator was designed to solve this problem.Simcsape software in MATLAB/Simulink was used to model the system,and the fuzzy PID control method was used to control the system,and compared with the traditional PID control method.The results show that by using the fuzzy PID controller,the dynamic performance of the system can be greatly improved, the overshoot is almost zero and the response speed is fast.