Bus box with multilayer routing and circuit distribution adapter provided with bus box

The utility model discloses a bus box with multilayer routing and a circuit distribution adapter provided with the bus box. The circuit distribution adapter comprises a metal outer casing and the bus box arranged inside the metal outer casing. The bus box includes a cavity, the cavity comprises a first limit plate and a second limit plate fastened with each other, outgoing buses are fixedly mounted on the inner side of the first limit plate, incoming buses are stacked on the side, away from the first limit plate, of the outgoing buses, insulating limit strips are arranged between the incoming buses and the outgoing buses, and insulation between the incoming buses and the outgoing buses is realized by the insulating limit strips. The circuit distribution adapter provided with the bus box not only can realize a three-phase four-wire routing manner, but also is simple in structure, high in plugging reliability and few in movable joints, and can effectively reduce thickness when being used with a corresponding movable plug.