The invention discloses a practical clutch working cylinder which comprises a cylinder body. A pressure cavity is arranged inside the cylinder body, a piston is arranged at the right end of the pressure cavity, an oil inlet is formed in the left side of the top end of the cylinder body and communicates into the pressure cavity, an oil inlet pipe is installed on the oil inlet and is provided with abuffer device, an air discharging opening is formed in the left end of the cylinder body, an air discharging screw is arranged in the air discharging opening, a push rod is arranged at the right endof the piston, a clamping groove corresponding to the push rod is arranged on the piston, a clamping sleeve is arranged at the contact position of the push rod and the piston, an end cover is arrangedat the right end of the cylinder body, and the right portion of the push rod penetrates the end cover to extend to the exterior to be connected with an outside car part. The practical clutch workingcylinder is simple in structure and reasonable in design, the service life of products is effectively prolonged, the leakproofness is good, the interior oil and gas leakage can be prevented, and outside dust can be prevented from polluting the internal structure.