In the operation process, the system is strongly nonlinear due to the throttle characteristics of hydraulic components and the dead zone, hysteresis and limit of hydraulic power components. In order to improve the robustness of the speed system in the fast injection stage of the diecasting machine, a control algorithm based on inverse model was proposed. The nonlinear model of the speed system was established. The reversibility of the system was analyzed, and the system was linearized into a pseudolinear system. The feedback control was used to design the linear system controller to realize the control of the system. MATLAB was used to verify the effectiveness of the fast injection speed control of diecasting machine based on the inverse system method.