Downhole hydraulic oil well pump

The utility model relates to a downhole hydraulic oil well pump and belongs to the field of mechanical equipment for oil extraction. The downhole hydraulic oil well pump comprises an oil well pump. The downhole hydraulic oil well pump is characterized in that the bottom of the oil well pump is provided with a hydraulic cylinder, wherein the hydraulic cylinder comprises a cylinder body, a piston rod and a piston; the piston is arranged in the cylinder body; the cylinder body is divided into two hydraulic cavities; one end of the piston rod penetrates through the cylinder body and is connected with the piston, and the other end of the piston rod is connected with an oil well pump plunger rod of the oil well pump; and the cylinder body is fixedly arranged on the shell of the oil well pump. Because the hydraulic cylinder is directly arranged at the bottom of the oil well pump, the mode that the original ground walking beam pumping unit drives a sucker rod to drive the oil well pump plunger rod to work is canceled, the phenomenon that a sucker rod and an oil pipe are worn in a well barrel is avoided, the downhole hydraulic oil well pump is simple in structure and stable in operation, and the occupied area is reduced; and because the hydraulic oil pump and a solenoid directional valve are directly arranged in the well barrel, the service life of the hydraulic oil pump and the service life of the solenoid directional valve are effectively prolonged.