The utility model relates to a structure of opening door soon for flameproof enclosure. It takes a lot of trouble difficultly existing problem of opening the door structure fastening intensity contrast soon in order to solve when the explosive -proof shell body adopts the bolt -up structure to open and close. The utility model discloses a structure of opening the door soon includes flame proof box, flame proof box body cover board, the hinge mechanism, characterized by: in the piston cylinder was inserted at the both ends of the hinge mechanism shifting shaft, on the fixer that is " U " font in the cross -section was fixed to the piston cylinder, the hinge mechanism passes through the hinge base to be fixed on flame proof box body cover board, and the fixer spiral -lock that the hinge mechanism is " U " font through the cross -section is on the edge of flame proof box. The utility model discloses an installing the binding that is " U " font on the door plant of the explosive -proof shell body, should fastening door plant and the box that explosive -proof shell personally experienced sth. Part of the body by " U " font binding through the hinge mechanism control, the explosive -proof shell that opens and close that can be very fast personally experiences sth. Part of the body, convenient maintenance and change to the casing internal plant.