Immersion foaming process means that organic foam is immersed in inorganic slurry, and porous material skeleton structure is obtained through a series of processes such as slurry hanging, drying and sintering. Organic foams generally have an open-cell network structure, so the pore structure formed after burning off the organic foams is a through-hole structure, and porous materials with high strength and high porosity can be obtained, but closed-cell products cannot be prepared.