The invention discloses a graphene composite material. The graphene composite material is composed of, by weight, 20 to 25 parts of graphene, 0.5 to 1 part of silicon, 3 to 5 parts of iron, 0.2 to 0.6 part of aluminum, 2 to 4 parts of manganese, 0.1 to 0.3 part of chrome, 0.05 to 0.08 part of cobalt, 0.5 to 1 part of carboxymethylcellulose, 1 to 3 parts of polyacrylamide, 5 to 7 parts of a potassium salt, 7 to 15 parts of silicon dioxide, 5 to 10 parts of titanium dioxide, and 0.5 to 2 parts of copper oxide. The graphene composite material is high in chemical stability, hardness, and specific surface area, low in cost, and wide in application range.