The invention relates to a composite wallboard for a fabricated steel
structure building. The composite wallboard for the fabricated steel
structure building sequentially comprises an aerated concreteboard base layer, an interface
processing layer, a bonding layer, an insulating layer, a protecting layer and an anti-
cracking face layer from bottom to top, wherein the aerated concrete board base layer and the insulating layer are composited together through the interface
processing layer and the bonding layer in a bonding manner, the heat preservation
mortar protecting layer is poured on the upper surface of the insulating layer, and the insulating layer is completely wrapped by the protecting layer; and the anti-
cracking face layer is painted or sprayed to the upper side of the protectinglayer, and the protecting layer, the insulating layer and the aerated concrete board base layer are mechanically anchored together through plastic anchor bolts. According to the composite wallboard for the fabricated steel
structure building, the aerated concrete board base layer has the advantages that the manufacturing material source is wide, materials are stable and the like,
machinability isgood, the problems of heavy object nailing and hanging on a wall and groove forming and pipeline distributing are solved, and the requirement for the wall thermal performance at cold and severe coldareas is met; and meanwhile, the composite wallboard for the fabricated steel structure building also has the characteristics of being small in weight, low in cost, simple in connection structure, convenient to construct and install and the like and is suitable for an outer wall of the fabricated steel structure building.