Using unsaturated polyester resin as the matrix, the fiber reinforced thermosetting composite material, also known as agglomerate molding compound (DMC), is a new type of environmentally friendly cover plate, which is made by compression molding technology. The composite manhole cover adopts high temperature and high compression molding technology, with high polymerization degree, high density, good impact resistance and tensile strength. It has the advantages of wear resistance, corrosion resistance, no rust, no pollution and maintenance free.