Insulated precast aerated concrete composite external wall panels, composed of aerated lime concrete (ALC) panels as the base, combined with composite insulation boards and 35mm thick Class A thermal insulation mortar, forming a lightweight composite insulated external wall panel, commonly referred to as composite insulated external wall panels. The composite insulated external wall panels are divided into two types based on their construction: Type 1 and Type 11. The system of insulated precast aerated concrete composite external wall panels consists of the composite insulated external wall panels mounted on the main structure, thermal insulation mortar leveling layer, coating layer, finishing layer, and thermal bridge insulation measures for beams, columns, etc., forming an external wall cladding system, abbreviated as the composite insulated external wall panel system. It belongs to the integrated thermal insulation and structural products for prefabricated buildings.