Refractory polycrystalline ceramic fibre blanket is made from a refractory fiber composed of γ-alumina/mullite crystal phase, which is produced by the "sol-gel" method to prepare spinning precursors. The precursors are then processed into embryonic cotton through spinning technology, and finally made into a blanket-shaped product through calcination and other processes. It has excellent insulation performance, corrosion resistance, and chemical resistance, and can be used in high temperatures and extreme environments. Widely used in industries such as petroleum, chemical, metallurgy, ceramics, glass, and power, for insulation and insulation of industrial equipment such as furnace insulation, pipeline insulation, and storage tank insulation.