The invention relates to a water jacket and air bag type sealing device for hydraulic test of an air bottle outside measuring method, in particular to a test container for forming seal between a water jacket and a water jacket cover. The sealing device mainly comprises a pressure test joint, the water jacket cover, a pneumatic joint, a flange, a rubber air bag, a connecting flange and the water jacket, wherein the pressure test joint is fixedly connected with the water jacket cover through a connecting bolt and an O-shaped ring which seals the connecting part; the pneumatic joint is fixedly connected to an outer circular face of the connecting flange; the rubber air bag and the connecting flange are placed between the flange and the water jacket and fixed through the connecting bolts; and the connecting faces of the connecting flange, the flange and the water jacket are sealed through an upper end face and a lower end face of the rubber air bag. The sealing device has a simple, compact and reasonable structure, has simple and convenient operation, is quick, effective and reliable to form a water jacket seal, can ensure smooth hydraulic test of the air bottle outside measuring method, and greatly improves the production efficiency.