Hollow silica is a silica material with a hollow structure, usually in the form of micrometer or nanometer spheres, particles, or porous. Its unique hollow structure gives it many excellent physical and chemical properties, making it widely used in many high-tech, high-performance fields. Hollow silica has good specific surface area, porosity, chemical stability and excellent thermal insulation properties, these properties make it an important material for catalysis, adsorption, drug delivery, electronic materials and other industries.