This paper takes the electric arc furnace electrode control for a f plant as a research subject, describes the structural design of system hardware, considering arc furnace, a non-linear time-varying system with very strong random interference, a fuzzy self-tuning PID controller is designed, through MATLAB simulation, it is proved that the system has good dynamic and static performance and strong anti-interference capability, three-phase electric arc furnace electrode can be effectively controlled by the fuzzy self-tuning PID.