Sintered heat-insulating brick and preparation method thereof

The invention discloses a sintered heat-insulating brick and a preparation method thereof. A green brick of the sintered heat-insulating brick comprises, by dry base weight, 50-90% of ash residue mixture, 10-30% of silica-alumina aggregate and 0-20% of hole forming material, the ash residue mixture comprises circulating fluidized bed ash residue and a heat correcting material, and doping amount ofthe heat correcting material is 0-20% of mass of the ash residue mixture. Doping amount of circulating fluidized bed ash in the sintered heat-insulating brick is 50-90%, other materials like furnaceslag, sawdust and rice hull ash used in a building block are industrial solid waste or byproducts, solid waste utilization rate is high, product quality is stable, each detection index of the sinteredheat-insulating brick produced by the method can reach national standard requirements, and the sintered heat-insulating brick has the advantages of high strength and high durability, meets environment-friendly, light-weight an