Container positive-negative-pressure locking device

The invention relates to the technical field of locking devices and discloses a container positive-negative-pressure locking device, wherein a negative-pressure locking mechanism and a positive-pressure locking mechanism are arranged on a fixed seat, the negative-pressure locking mechanism comprises a first cylinder which is installed on the fixed seat, a U-shaped connecting seat is arranged at the shaft end of the first cylinder on the fixed seat, both sides of the U-shaped connecting seat are respectively provided with a J-shaped guide hole, a clamping jaw is arranged in the U-shaped connecting seat, the clamping jaw is fixedly connected with the shaft end of the first cylinder, both sides of the clamping jaw are respectively provided with a guide pin, and both ends of the guide pin respectively extend into the J-shaped guide holes; the positive-pressure locking mechanism comprises a cylinder bracket which is installed on the fixed seat, a second cylinder is arranged on the cylinder bracket, the shaft end o