Steel structure protective airtight door

The utility model relates to the technical field of airtight doors. The steel structure protective air-tight door comprises a door body, the door comprises a door body and a door frame, the door bodyis installed in the door frame through hinges. An electromagnetic block moving chamber is formed in the door body; an opening is formed in one side of the electromagnetic block moving chamber; an electromagnetic block is arranged in the electromagnetic block moving chamber; a rope is bolted and fixed on one side of the electromagnetic block; the rope penetrates through the fixed pulley in a winding mode, the end, penetrating through the fixed pulley, of the rope is fixed to the rotating ring in a winding mode, the door body is provided with the control panel, the control panel is connected with the electromagnetic block through a wire, and therefore the airtight door can be opened and closed through the control panel and manpower, and workers can conveniently open and close the airtight door during maintenance. 本实