The invention discloses an expansion and sealing type movable fireproof door. The expansion and sealing type movable fireproof door comprises a fireproof door frame, a connection hinge and a fireproofmain bracket body, wherein the inner side of the fireproof door frame is provided with a fireproof door sheet, the left side of the fireproof door sheet is provided with the connection hinge, the fireproof door sheet is connected with the fireproof door frame through the connection hinge, the fireproof door sheet is provided with a lock, a sealing ring is arranged between the fireproof door sheetand the fireproof door frame, the inner side of the fireproof door sheet is provided with an insulated door sheet, a vertical rod is provided with a third board body, and the third board body is located in a fireproof auxiliary bracket body. The expansion and sealing type movable fireproof door has the advantages that after high-temperature combustion is carried out, the fireproof door sheet, a fireproof door frame framework, the fireproof main bracket body and the fireproof auxiliary bracket body which are made from a stainless material still provide a good protective capacity, so that a burned penetration phenomenon is avoided, thereby preventing the situations of fire spreading and flue gas leakage, and the escape time can be prolonged for related personnel, thereby improving the escape probability of the related personnel.