The invention relates to the design field of a nuclear industry box, in particular to a vertical butt-type universal hot-chamber maintenance air brake, which comprises an air brake main body and a dual-cover sealing door system, wherein the air brake main body is divided into a plurality of independent subareas, and all subareas are connected with one another through an air-brake sealing door; and the bottom of one independent subarea of the air brake main body is provided with a dual-cover sealing upper door, a top plate of a hot-chamber shell is provided with a corresponding dual-cover sealing lower door, and the dual-cover sealing upper door and the dual-cover sealing lower door form the dual-cover sealing door system. Due to the adoption of the vertical butt-type universal hot-chamber maintenance air brake, rapidness in butt joint and separation of multiple hot chambers can be realized through one air brake, the connection surface of the air brake after being separated is free from being polluted; and meanwhile, the vertical butt-type universal hot-chamber maintenance air brake has the advantages of high strength, good sealing performance, convenience in transportation and the like.