The energy saving method for electrohydraulic servo system based on predictive controller was designed to achieve the effect of energy saving while the electrohydraulic servo system was controlled to track the expected position accurately. Based on the principle of electrohydraulic servo system, the working principle and structure of the electrohydraulic servo system were analyzed.The pressure differences between the chamber of the hydraulic cylinder and the pressure of the oil tank and the supply pressure were calculated by using the valve core displacement of the proportional directional control valve.By using the displacement of the piston, the pressure continuity equation in the chamber was obtained. On the basis of considering the damping coefficient of the proportional directional control valve, the corresponding motion equation was established. The dynamic equation of the proportional relief valve was obtained by using its opening degree. The state model of the electrohydraulic servo system was established by using the chamber pressure and the opening degree of the proportional relief valve.Based on the expected position, the expected pressure in the chamber was calculated, and then the required supply pressure was obtained.By using the required supply pressure,a predictive controller was constructed to predict and control the speed of the motor, then the effect of dynamic regulation of supply pressure was achieved and energy saving control was realized. The experimental results show that compared with the constant pressure method using sliding mode control, the tracking accuracy of the method for sine and random expected position is improved by 44.93% and 39.98% respectively, and the corresponding energy consumption is reduced by 13.45% and 10.54% respectively. This method has a good effect on the position control and energy saving control of the electro-hydraulic servo system.