High-sealing-performance hydraulic oil cylinder

The utility model discloses a high-sealing hydraulic oil cylinder which comprises a cylinder body, a standby cap is movably installed at the upper end of the cylinder body, an oil return mechanism is fixedly installed at the upper end of the standby cap, the oil return mechanism comprises an oil return pipe, and a dust removal sealing ring and a pressing rod are arranged at the upper end of the oil return pipe. The oil return mechanism has the advantages that due to the fact that the oil return mechanism is arranged, when the piston rod stretches out of the cylinder body, lubricating oil is brought out, when the piston rod makes contact with the oil absorption sponge block in the oil return pipe, the oil absorption sponge block is not in contact with the oil return pipe, and the oil absorption sponge block is not in contact with the oil return pipe. When the hydraulic oil cylinder is used, redundant lubricating oil on the surface is absorbed and stored by the oil absorption sponge block, the piston rod retrac