Corundum composite brick and preparation method thereof

The invention provides a corundum composite brick and a preparation method thereof. The corundum composite brick comprises a corundum heavy layer and a heat insulation layer combined with the corundum heavy layer, the corundum heavy layer is prepared from the following raw materials in percentage by weight: 35 to 75 percent of corundum, 10 to 30 percent of andalusite, 5 to 15 percent of aluminum oxide powder, 0 to 10 percent of chromium sesquioxide powder, 0 to 10 percent of zirconium oxide powder and 3 to 8 percent of binding clay; the heat insulation layer is prepared from the following raw materials in percentage by weight: 15 to 65 percent of aluminum oxide hollow spheres, 15 to 65 percent of mullite, 5 to 15 percent of aluminum oxide powder and 3 to 8 percent of binding clay. The corundum composite brick not only has excellent refractoriness and heat insulation effect, reduces heat loss, but also is convenient to construct and stable in structure, and can improve the use stability and operation efficienc