With the rapid development of my country′s smart grid, live robots are gradually being used to replace manual tasks for routine maintenance and accident repairs. However, there are problems of low control precision and jitter in live work robots, which affect the quality and efficiency of work tasks. In order to solve this problem, a fuzzy PID (proportion intergration differentiation) controller is designed to realize the precise control of the output displacement of the live working robot. Firstly, the structure of the live working robot and the principle of the hydraulic system are analyzed, the mathematical model of the main components of the hydraulic system is established, and the transfer function model of the system is deduced. Secondly, the closed-loop fuzzy PID controller of the output displacement of the live working robot is designed based on fuzzy rules. Finally, the simulation models of the original system, PID and fuzzy PID control schemes are established in the Simulink environment for simulation analysis, and the prototype is tested experimentally. The simulation results show that: compared with the original system and the PID control system, the adjustment time of the fuzzy PID control system is relatively shortened by 81.3% and 30.8%, and the overshoot is reduced by 0.064, achieving no overshoot and having better position tracking ability. In addition, the experimental data results of the prototype are consistent with the simulation results, indicating that the fuzzy PID controller has better application effect.