A unitary air conditioning unit of a railway train, comprising a set of apparatus, which has an integrated structure and comprises: a body, a mounting base provided at a periphery of a top portion of the body, and a mixed air tank provided at each of two sides of the body, wherein the unitary air conditioning unit is configured to be mounted to an air conditioning unit mounting opening of a top portion of the railway train by the mounting base in a manner of embedding and sinking, a sealing component is provided between the mounting base and a vehicle body, the mounting base is configured to be connected to the vehicle body by a connection member, a top surface of the unitary air conditioning unit thereby being lower than or flush with a top portion of the vehicle body, and a grille-type pressure wave protection device is provided at each of two sides of the unitary air conditioning unit and communicated with the body through the mixed air tank, wherein the grille-type pressure wave protection device comprises at least one ventilation board, at least one grille air port, at least one strip-shaped sealing member and a driver, and, the grille air port is provided in the ventilation board, the at least one strip-shaped sealing member corresponds to the at least one grill air port one to one, and the driver drives the at least one strip-shaped sealing member to move for closing the at least one grille air port, the set of apparatus for a unitary air conditioning unit further comprises a plurality of grille air ports arranged on the ventilation board in sequence, wherein the at least one strip-shaped sealing member is horizontally arranged and parallel to an extension direction of the at least one grille air port, and the strip-shaped sealing member is provided below a corresponding grille air port and movable to close or to be separated from the corresponding grille air port, wherein a mounting beam is provided at each of two sides of the mounting base, the mounting beam is provided with a mounting hole for connecting to the vehicle body by a bolt, the mounting beam is provided with the sealing component, and a heat insulation board is provided at an outer periphery and a bottom surface of the mounting base. a body, a mounting base provided at a periphery of a top portion of the body, and a mixed air tank provided at each of two sides of the body, wherein the unitary air conditioning unit is configured to be mounted to an air conditioning unit mounting opening of a top portion of the railway train by the mounting base in a manner of embedding and sinking, a sealing component is provided between the mounting base and a vehicle body, the mounting base is configured to be connected to the vehicle body by a connection member, a top surface of the unitary air conditioning unit thereby being lower than or flush with a top portion of the vehicle body, and a grille-type pressure wave protection device is provided at each of two sides of the unitary air conditioning unit and communicated with the body through the mixed air tank, wherein the grille-type pressure wave protection device comprises at least one ventilation board, at least one grille air port, at least one strip-shaped sealing member and a driver, and, the grille air port is provided in the ventilation board, the at least one strip-shaped sealing member corresponds to the at least one grill air port one to one, and the driver drives the at least one strip-shaped sealing member to move for closing the at least one grille air port, the set of apparatus for a unitary air conditioning unit further comprises a plurality of grille air ports arranged on the ventilation board in sequence, wherein the at least one strip-shaped sealing member is horizontally arranged and parallel to an extension direction of the at least one grille air port, and the strip-shaped sealing member is provided below a corresponding grille air port and movable to close or to be separated from the corresponding grille air port, wherein a mounting beam is provided at each of two sides of the mounting base, the mounting beam is provided with a mounting hole for connecting to the vehicle body by a bolt, the mounting beam is provided with the sealing component, and a heat insulation board is provided at an outer periphery and a bottom surface of the mounting base.