Replacing device of safety valve

The utility model relates to a replacement device of safety valve, which can realize the replacement of a safety valve under the condition of a system without pressure relief. In the utility model, a valve cover sheathed on a rotating disk can be rotated follow the rotating disk and do axial reciprocating motion at the same time by the driving mechanism for valve cover doing circumferential motion arranged on a casing and the rotating disk and the driving mechanism for the valve cover doing axial motion arranged on the rotating disk and the cover plate of the casing, and then the valve cover realizes closing and opening to a valve port arranged on the covering plate of the casing. When the valve port is closed, a safety valve installed on an installing opening on the upper end of valve port can be disengaged with a pressure system, and then the safety valve can be replaced under the condition of the system without pressure relief.