The servo energy-saving series injection molding machine is equipped with a high-performance servo variable speed power control system. It can make different frequency outputs for different pressure flows during the molding process of the injection molding machine, and perform precise closed-loop control of the pressure flow, so as to achieve high-speed response, optimal matching and automatic adjustment of the servo motor to the energy demand of the injection molding machine. 1. Use energy-saving devices such as servo controllers and servo motors with excellent performance. 2. Sensitive servo control system, fast start reaction time is only 0.04S. 3. The servo motor and hydraulic system form a closed-loop control, which greatly improves the repetition accuracy compared with traditional models. 4. Reduce the impact of opening and locking molds, and extend the service life of mechanical parts and molds. 5. Reduce the use of electricity. Saving energy 20%-80%,low noise.