Plunger pump servo hydraulic system

The utility model discloses a plunger pump servo hydraulic system which comprises a machine frame, a servo motor is arranged on the machine frame, the servo motor is connected with an oil pump, the oil pump is connected with an external oil tank and a hydraulic cylinder through an oil pipe, the bottom of the hydraulic cylinder is connected with a plunger pump body, and a pipeline is connected below the plunger pump body. One-way valves are arranged at the positions, located at the front end and the rear end of the plunger pump body, of the pipeline and comprise valve seats connected with the pipeline, inner holes are formed in the inner sides of the valve seats, valve rods are arranged above the inner holes and fixedly connected with the tops of the valve seats through valve covers, springs are arranged between the valve rods and the valve covers, valve plates are arranged at the tail ends of the valve rods, sinking grooves are formed in the bottom faces of the valve plates, and sealing pieces are arranged in