Diamond composite sheet, referred to as PCD, is a composite superhard material sintered by diamond mixed powder and cemented carbide matrix at high temperature and high pressure. The diamond crystal of PCD is disordered, isotropic, no cleavage surface, with high hardness, high wear resistance and high thermal conductivity of diamond; The cemented carbide layer as the base has high resistance toughness and weldability. Therefore, PCD is especially suitable for non-ferrous metals, non-metallic materials cutting tools and various instruments and equipment support wear-resistant parts.