Lightweight mullite products are mainly made of mullite raw materials, which are formed and fired by adding aluminum oxide powder, calcined powder, clay, and a certain proportion of loss on ignition agent. It has the advantages of small specific gravity, low thermal conductivity, high temperature resistance, and high strength, and is widely used in the lining of hot air furnaces, glass crucibles, low temperature tunnel kilns, roller kilns, and shuttle kilns, with broad application prospects.