Stepped special-shaped aluminum plate curtain wall system

The invention provides a stepped special-shaped aluminum plate curtain wall system. The stepped special-shaped aluminum plate curtain wall system comprises a vertical edge-locked roof board, a circular tube keel and a special-shaped aluminum plate. The inner side of the circular tube keel is connected with the vertical edge-locked roof board through a plurality of sets of keel connecting assemblies and a plurality of sets of roof board fasteners; a plurality of sets of aluminum plate connecting assemblies are fixedly connected to the outer side of the circular tube keel; a connecting disc is fixedly connected to the outer side of each set of aluminum plate connecting assembly, and a plurality of arc-shaped holes are formed in each connecting disc in the circumferential direction of the connecting disc; the inner side of the special-shaped aluminum plate is fixedly connected with aluminum plate connecting pieces, and in the two aluminum plate connecting pieces which are arranged in a stepped manner and are adj