Oil jack

The utility model provides an oil jack, include: oil -well pump, pump outer tube, first joint and second connect, the pump outer tube is hollow structure, and the pump body setting of oil -well pump forms a holding chamber between the outer wall of the inner wall of pump outer tube and the pump body of oil -well pump in the pump outer tube, first joint includes an oil inlet and an exhaust apparatus, and an exhaust apparatus is the cylinder shape, just follows axial direction among the exhaust apparatus and is provided with a plurality of first through -holes, and first through -hole runs through an exhaust apparatus's upper and lower bottom surface, the second connects including oil -out and the 2nd exhaust apparatus, and the oil -out setting is in the 2nd exhaust apparatus, and the 2nd exhaust apparatus is the cylinder shape, follows axial direction among the 2nd exhaust apparatus and be provided with a plurality of second through -holes around the oil -out, and the second through -hole runs through the 2nd exhaust apparatus's upper and lower bottom surface, the first end position of the pump body of oil -well pump is directly over the first end of pump outer tube. The utility model provides an oil jack has improved oil -well pump petroleum production and pump efficiency per hour.