The utility model provides an integrated normally-closed uncoupling air pipe connector and a coupler thereof, which comprise a sealing ring, a valve body, a valve rod, a sealing bolt, a sealing gasketand a spring part, and are integrated with a main air pipe connector and then mounted on the coupler body. The sealing ring is mounted at the front part of the valve rod; wherein the sealing gasket is installed in the sealing bolt, the valve rod is installed in the valve body and can slide in the valve body after being stressed, the sealing bolt is connected with the rear portion of the valve rodthrough threads and abuts against the valve body together with the sealing gasket under the action of the spring, and the spring is installed between the sealing bolt and the main air pipe connector.According to the scheme of the utility model, the valve body, the hook body and the positioning hole of the main air pipe connector are mounted, and the mounting and positioning precision of the decoupling air pipe connector is improved through hole-shaft matching; meanwhile, the length of the guide sections of the valve body and the valve rod is increased through the rear arrangement of the spring, and the action stability of the valve rod is further improved.