Sleeve sealing device

The utility model relates to the field of sleeves, in particular to a sleeve sealing device which comprises a sealing cover and a sleeve connected with the sealing cover, one end, close to the sleeve, of the sealing cover is fixedly connected with a sealing gasket, a locking mechanism is arranged in the sealing cover, and the locking mechanism comprises two locking blocks which move relative to each other. According to the casing pipe sealing device, when a casing pipe needs to be sealed, a sealing cover needs to be installed at the moment, firstly, a sealing gasket on the sealing cover is plugged into the casing pipe, then a pulling block is moved inwards at the same time, then a rotating plate is rotated, and at the moment, the casing pipe is sealed through rotation of the rotating plate. The sealing cover and the sleeve can be fixed by moving the pull block inwards at the same time, so that the sleeve can be sealed and fixed, good sealing and protecting effects are achieved, and the sealing cover and the s