Nano silica is one of the most important high-tech ultra-fine inorganic new materials. Due to its small particle size, large specific surface area, strong surface adsorption, large surface energy, high chemical purity, good dispersion performance, thermal resistance, resistance and other aspects, it has unique characteristics in many disciplines and fields and plays an irreplaceable role with its superior stability, reinforcement, thickening and thixotropy. Nano silica, commonly known as "ultra-fine white carbon black", is widely used in various industries as additives, catalyst carriers, petrochemical industry, decolorizing agent, matting agent, rubber reinforcing agent, plastic filler, ink thickener, metal soft polishing agent, insulation and thermal insulation filler, advanced daily cosmetics filler and spraying materials, medicine, environmental protection and other fields.