The utility model relates to a hydraulic pressure is from inhaling formula oil -well pump, a serial communication port, hydraulic cylinder body's one end with the pump body passes through sealing bolt fixed connection, the one end of piston rod with connecting device links to each other, the other end of the piston rod is provided with a piston, the piston rod passes through the piston is in slide in the hydraulic cylinder body, be equipped with the inlet port on the pump body, the inlet port runs through the base support. The utility model discloses simple structure, convenient operation operates steadily, through add the sealing washer between the hydraulic cylinder body and the pump body, has effectively solved the oil -well pump pump body and has not got well the problem that leads to the draining because of the leakproofness, adopts the oil -well pump piston of nanometer carbon material, has prolonged the life of piston greatly, through set up the filter screen on the inlet port, has effectively reduced the oil -well pump to cause the sand card at the operation in -process because of sand grain stream advances the pump body, has improved work efficiency greatly.