Disclosed is natural gas pipeline under-pressure plugging equipment

The utility model discloses under-pressure plugging equipment for a natural gas pipeline. The pipeline structurally comprises a pipeline main body, a connecting disc, an air vent and an air blocking device, an air blocking device is arranged between pipeline main bodies; external air supply equipment is started to supply air to the air cylinder; a piston rod of the air cylinder moves downwards topush the push plate to move downwards in the sliding groove; the clamping grooves are stabilized; preliminarily sealing the arc opening; then, an air supply pipe of external air supply equipment is connected with the connecting pipe; the rotating ring is rotated under the action of the rotating piece; the joint of the air supply pipe and the connecting pipe is clamped; the gas supply pipe and theconnecting pipe are connected through the fixing piece at the connecting protruding block, the stability of the connecting position of the gas supply pipe and the connecting pipe is improved, the gasbag is inflated through the