The utility model provides a sealing device is used in pipe pushing jack business turn over hole, reach the sealed steel loop coaxial with it and the elasticity sealed bladder body including entranceto a cave ring beam, sealed steel loop sets up in entrance to a cave ring beam one side, and its internal diameter is not less than entrance to a cave ring beam, it is inboard that sealed steel loop is located to the sealed bladder body. The utility model provides a sealing device is used in pipe pushing jack business turn over hole can generally use in all kinds of stratum, only the thick liquidis sealed respond well, can ensure the stability the when hole is passed in and out to the pipe pushing jack.