Highly-sealed hydraulic pushing jack and using method

The invention discloses a high-sealing type hydraulic pushing jack, which relates to the technical field of hydraulic oil cylinders and comprises a cylinder body assembly, a piston rod, a piston head and a sealing assembly. The invention further discloses a using method of the high-sealing type hydraulic pushing jack. The using method comprises the following steps of equipment installation, target jacking, target releasing and equipment maintenance. According to the invention, the cylinder body assembly is arranged, the piston rod is arranged in the cylinder body assembly, the sealing assembly is arranged at one end of the cylinder body assembly, the sealing assembly comprises the sealing seat, and the sealing seat can realize sealing between the cylinder body assembly and the piston rod; the arrangement of the dirt blocking pad can effectively prevent the piston rod from bringing sludge and dust into the cylinder body assembly, the outer layer pad is arranged at one end of the dirt blocking pad, the dirt blo