Leak-proof hydraulic oil cylinder

The utility model discloses a leakproof hydraulic oil cylinder, which relates to the technical field of hydraulic cylinders and comprises a cylinder body, a piston rod and a piston, the piston rod is slidably sleeved with the cylinder body, the piston is fixedly sleeved with the piston rod, first annular grooves are symmetrically arranged on two sides of the piston, and an outer ring of the piston is sleeved with a sealing component and a compensation component which are connected with each other. According to the anti-leakage hydraulic oil cylinder, the extruded compensation ring moves, the weakening groove deforms to provide extrusion supporting for the sealing ring, meanwhile, the compensation ring on the other side is affected by suction force to conduct extrusion supporting on the sealing ring, and therefore a gap capable of achieving circulation is prevented from being generated between the piston and the cylinder body, and the sealing performance of the sealing ring is improved. High-pressure oil is pr