High-precision servo hydraulic closed-loop control system

The invention discloses a high-precision servo hydraulic closed-loop control system, which comprises a rack, and a control system and a hydraulic servo system arranged on the rack, wherein the controlsystem comprises a servo motor bus, a servo motor driver, a PLC (Programmable Logic Controller), a stay wire sensor and an angle sensor; the hydraulic servo system comprises a servo motor, a hydraulic electromagnetic valve, a pressure adjusting knob, an oil pump, an oil pressure gauge, a hydraulic oil filter, an oil pressure motor and an oil pressure cylinder; the servo motor bus is connected with the servo motor; the stay wire sensor is used for detecting the displacement precision of the hydraulic cylinder; the angle sensor detects the rotation precision of the hydraulic motor; the stay wire sensor and the angle sensor transmit displacement and angle data to the PLC; and the PLC analyzes the current position according to the data provided by the stay wire sensor and the angle sensor andtransmits the data to the