Air tightness detection tool for cylinder cover cap

The utility model provides a cylinder cover airtightness detection tool comprising a top plate, the middle position of the upper surface of the top plate is provided with a vertically arranged circular hole, a vertically arranged hollow pipe is fixed in the circular hole, and the upper end of the hollow pipe is provided with an air supply valve used for connecting an air supply pipeline. The lower end of the hollow pipe extends to the lower side of the top plate and is sleeved with a sealing plug which is fixedly connected with the hollow pipe and used for blocking an air cylinder cover hole, two vertically-arranged first electric push rods are symmetrically installed on the lower surface of the top plate, and the cylinder body ends of the first electric push rods are fixed to the upper surface of the hollow base. A groove is formed in the middle of the upper surface of the hollow base, a supporting plate used for supporting the cylinder cover is arranged in the groove, and a plurality of rolling pieces used