In order to improve the antiinterference ability of motion control of a Stewart platform, an improved double fuzzy PID control system was designed, and the control error was verified by simulation. The Stewart platform sketch was created in the coordinate system, and the motion equation of the connecting rod was deduced by using matrix transformation. The hydraulic drive mechanism of Stewart platform was designed, and the flow control equation of hydraulic servo valve was given. Based on the traditional PID control, a double fuzzy PID controller was designed, and the double fuzzy PID controller was optimized by using particle swarm optimization. The motion path tracking error of Stewart platform was simulated using MATLAB software. The simulation result shows that by using the improved double fuzzy PID controller, the Stewart platform motion path can still maintain a high tracking accuracy when moving in the interference environment, and the response speed is fast and the adjustment effect is good to the external interference. By using the improved double fuzzy PID controller, the antiinterference ability of the Stewart platform control system is strong, and the tracking accuracy of the Stewart platform motion path is improved