Anti-loosening sealing cover of pressure container

The utility model discloses an anti-loosening sealing cover of a pressure container. The anti-loosening sealing cover comprises a pressure container main body, a sealing cover main body, a fixed shaft rotating assembly, a turntable, a limiting mechanism and a connecting rod, the limiting mechanism comprises a limiting anti-loosening piece and a second limiting frame, one end of the connecting rod is rotationally connected with the side of the rotary disc, and the other end of the connecting rod is rotationally connected with the limiting anti-loosening piece. The arrangement mode that the rotating disc and the limiting mechanism are matched is utilized, one end of the connecting rod is driven by the rotating disc to rotate, the limiting anti-loosening piece is conveniently pulled through the connecting rod, and the limiting anti-loosening piece linearly slides towards the direction of the rotating disc under limiting of the second limiting frame; the limiting anti-loosening piece is clamped outside the pressu