Coarse-hole sponge filter screen is made of ordinary open-hole soft foam through mesh processing. Net processing removes the original mask or wall membrane between foam networks and obtains the main skeleton network structure. The void ratio of this foam is as high as 97%, which has excellent air permeability, good softness and high mechanical strength. Using net bubble as filter material has the advantages of small flow resistance and high filtration rate. It can effectively filter out particles with a particle size of 15UM. Mesh foam has many special applications, such as filter material, fuel oil tank filling materials and fabric processing materials. Many new functional materials, such as mesh ceramics, mesh metal and mesh activated carbon, can be manufactured with mesh bubbles as the framework. In addition, the net bubble is easy to wash and can be used repeatedly. It is a multifunctional and economical filter material, widely used in industrial production, vehicles and civil equipment filtering devices. At the same time, filters with excellent flame retardant effect can be made according to customer requirements.