Multilayer wiring bus box and circuit allocation adapter with same

The invention discloses a multilayer wiring bus box and a circuit allocation adapter with the same. The circuit allocation adapter comprises a metal shell and the bus box arranged in the metal shell. The bus box comprises an insulated cavity formed by buckling a first limiting plate and a second limiting plate. An outgoing bus is fixedly arranged on the inner side of the first limiting plate. An incoming bus is stacked on the side, away from the first limiting plate, of the outgoing bus. Insulated limiting strips are arranged between the incoming bus and the outgoing bus. The incoming bus and the outgoing bus are insulated by the insulated limiting strips. The circuit allocation adapter with the bus box not only can realize a three-phase four-wire wiring way, but also is simply structured, high in splicing reliability and fewer in moving contacts; and the thickness of the circuit allocation adapter can be effectively reduced after a movable plug corresponding to the circuit allocation adapter.