Liquid-driven piston type hydrogen compressor

A hydraulic drive piston type hydrogen compressor comprises an oil cylinder and air cylinders, the oil cylinder is connected with the air cylinders at the two ends through guide sleeves respectively, an air inlet hole and an air outlet hole are formed in end covers of the air cylinders, piston rods extending axially are arranged at the two ends of an oil cylinder piston in the oil cylinder, and the extending ends of the piston rods penetrate through guide holes of the guide sleeves and are connected with the air cylinder pistons in a threaded fit mode. A nitrogen isolation cavity used for preventing oil and gas from channeling is formed in the guide sleeve and is an annular groove formed in the inner wall of the guide hole, a nitrogen inflation hole and a leaked gas recovery hole are formed in the wall of the guide sleeve, and an oil return hole is communicated with the nitrogen isolation cavity and used for injecting nitrogen into the nitrogen isolation cavity to isolate hydraulic oil and hydrogen and recove