Composite filter material with carbon fiber sandwich as well as preparation method and application of composite filter material

The invention provides a composite filter material with a carbon fiber sandwich as well as a preparation method and application of the composite filter material. The composite filter material is obtained by sintering and pressing a first metal fiber layer, a second metal fiber layer and a sandwich layer arranged between the two metal fiber layers, the first metal fiber layer is obtained by pressing disorderly laid first metal fibers; the sandwich layer is composed of an inner area and an outer area, chopped stainless steel fibers are laid in the outer area in a disordered mode, chopped carbon fibers are laid in the inner area in a disordered mode, and the outer area completely surrounds the inner area; and the second metal fiber layer is obtained by pressing disorderly laid second metal fibers. The composite filtering material not only has the specific advantages of high porosity, high mechanical strength, high pollutant holding capacity and processing weldability of the metal fibers, but also has the specifi