Basalt fiber needle-punched felt is a disorderly interleaved single fiber, forming a non-directional three-dimensional microporous structure. Due to the use of 5.5μm and 7μm finer fibers, the specific surface area is large, the porosity is about 80%, and it does not contain boron. It can be used for advanced air filtration and purification, heat insulation and sound absorption, heat preservation materials, hot rolled mirror steel, aluminum plates and high temperature resistance Soft bedding materials, etc.