Integrated oil cylinder and unclamping cylinder adopting same

An integrated oil cylinder comprises an oil cylinder body formed through machining, the oil cylinder body comprises an oil cylinder barrel and an oil cylinder flange, a piston cavity is formed in the middle of the oil cylinder barrel, an inner shoulder part is arranged in the piston cavity, a reinforcing sleeve is arranged on the inner shoulder part, a mounting groove for mounting a sealing flange plate is formed in the lower end face of the oil cylinder flange, and an oil outlet hole is formed in the piston cavity. The oil outlet hole penetrates through the oil cylinder flange to form an oil outlet pipe connecting hole; fixing holes fixed on equipment are formed in the periphery of the flange plate; a fixing hole fixed with the flange plate is formed in the upper end of the oil cylinder barrel. According to the utility model, the integrated oil cylinder structure is more stable, the oil cylinder sealing is more effective, and the whole oil leakage is avoided; the reinforcing sleeve is connected with the oil