Lightweight and energy-saving composite wall panel is made of industrial waste fly ash, slag, ceramics, portland cement and EPS foam particles as the main raw materials. The production process is simple, the cost is low, and the economic benefits are considerable. The industrialization and commercialization of residential construction in this century have been irreversible. According to the development of wall materials in developed countries, the product is in line with the development law, which overcomes the defects of other lightweight wall panel, has unique performance, and will be the leader in new wall materials. The wall panel uses industrial waste fly ash, slag, and EPS foam particles as the main raw materials, which are environmental friendly; at the same time, low-cost ordinary chemical raw materials are used as the main raw materials, and both raw materials are abundant and widely sourced.