The utility model relates to a group and aerify cabinet thereof. The group includes along what left right direction set up side by side aerifys the cabinet more than two, aerifys the cabinet and includes the cabinet body, and the cabinet body is equipped with the main bus -bar room of arranging in the bus -bar room top including bus -bar room, the top of the cabinet body, installs insulating mainbus -bar in the main bus -bar room, indoor voltage transformer or the arrester still arranged of main bus -bar, and the upper portion of bus -bar room is provided with the wiring end, and a pluralityof main bus -bar rooms of aerifing the cabinet communicate on left right direction. Set up the main bus -bar room in the top of bus -bar room, it is indoor that voltage transformer or arrester and insulating main bus -bar are located the main bus -bar, the mounted position of the main bus -bar room attachment of apparatus in its inside device that sets up and the bus -bar room of not only being convenient for, and its position mainly utilizes the vertical space of aerifing the cabinet moreover, does not as far as occupy great transverse space under the condition that realizes installation generating line side voltage transformer or arrester, makes the whole cabinet compact structure that aerifys, is favorable to aerifing the miniaturized of cabinet and develops.