Storage tank sealing device with high reliability

The storage tank sealing device with the high reliability comprises a tank body, a cover plate is arranged on the upper end face of the tank body, the left side of the cover plate is hinged to the tank body through a hinge, a fixing ring is fixedly connected into the tank body, a square groove is formed between the upper end and the lower end of the fixing ring, and a sealing ring is arranged in the square groove. The lower end face of the cover plate is fixedly connected with a fixing block matched with the square groove, a containing groove is formed in the outer wall of the fixing block, and a sealing mechanism used for sealing the square groove and the fixing block is arranged in the containing groove. The movable rods move to push the sealing plates to move, the sealing plates move to the positions between the sealing grooves and the containing grooves, gaps between the fixing blocks and the square fixing grooves are sealed, the sealing performance of the tank body is improved, elastic cloth and a telesc