Assembled aerated concrete composite thermal insulation exterior wall panels, consisting of a base of autoclaved aerated concrete panels (ALC boards), combined with composite thermal insulation boards and 35mm thick Class A thermal insulation mortar, forming a lightweight composite thermal insulation exterior wall panel, commonly referred to as the composite thermal insulation exterior wall panel. The composite thermal insulation exterior wall panels are divided into two types based on construction: Type 1 and Type 11 composite thermal insulation exterior wall panels. The assembled aerated concrete composite thermal insulation exterior wall panel system comprises an exterior wall protection system consisting of composite thermal insulation exterior wall panels installed on the main structure, leveling layer of thermal insulation mortar, coating layer, finish layer, as well as thermal bridge treatment measures for beams, columns, etc., commonly referred to as the composite thermal insulation exterior wall panel system. It belongs to the integrated thermal insulation and structural products for prefabricated buildings.