High-precision digital hydraulic oil cylinder

The invention provides a high-precision digital hydraulic oil cylinder, and relates to the technical field of digital hydraulic oil cylinders. The high-precision digital hydraulic oil cylinder comprises a cylinder body, a piston, a piston rod, a screw seat, a feedback screw, a first encoder, an oil way valve seat, a hydraulic oil supply unit, a servo motor and a controller. According to the high-precision digital hydraulic oil cylinder, the requirement standard for the hydraulic oil supply unit is low, the hydraulic oil supply unit only needs to provide hydraulic oil with set pressure, the servo motor drives the gear set to rotate according to the pulse number, and therefore the hydraulic oil is quantitatively pressed into a rod cavity or a rodless cavity of the cylinder body; the moving speed or displacement of the piston of the oil cylinder is accurately controlled, the moving speed or displacement of the piston is directly fed back through the screw pair, and real-time and accurate closed-loop control over