The invention discloses a reinforced concrete single-door protective safety sealing door and a using method thereof. The reinforced concrete single-door protective safety sealing doorcomprises a door frame, a baffle, a transverse limiting rod, a door panel, a cover plate, a fixing block, support rods, fixing columns, an adjusting block, a limiting block, a rotating rod,and a sliding block;the baffle is fixed to the inner wall of the door frame, the door panel is arranged on one side of the door frame, a sealing plate is fixed to one side of the door panel, protective boxesare symmetrically fixed to one side of the door frame, the fixing columns are fixed to the interior of the protective boxes, the support rods are arranged in the protective boxes,one ends of the support rodsarearranged on the outer sides of the fixing columns in a sleeving mode, the support rods are rotatably connected with the fixing columns through bearings, and the ends, away from the fixing columns, of the support rodsare fixedly connectedwith the door panel. According to the reinforced concrete single-door protective safety sealing door and the using method thereof,the movement directions of the transverse limiting rod and a longitudinal limiting rod are adjusted by arranginga pushing plate, a limiting plate, and an adjusting plate, thus the door panel and the door frame are sealed, operation is convenient, operation time is saved, and the work efficiency is improved.