Die casting machine working in bad environments, with more interferences, making parameters take place great changes, affects the stability of system, in the traditional PID linear control when controlled object changed, the control characteristic changed immediately. According to this shortcoming,this paper using Adaptive fuzzy PID control technology, and by using the nonlinear characteristics of fuzzy control to compensate PID controller, thus to the good control of electrohydraulic proportional valve, making the system to achieve an optimal control state. Through the simulation results we can see that the adaptive fuzzy PID control method is feasible.