Carbon fiber is a new type of fiber material with high strength and high modulus fiber with a carbon content of more than 95%. It is a microcrystalline graphite material obtained by stacking organic fibers such as flake graphite microcrystals along the axial direction of the fiber and undergoing carbonization and graphitization treatment. Carbon fiber is a new material with excellent mechanical properties. Its specific gravity is less than 1/4 of that of steel. The tensile strength of carbon fiber composite materials is generally above 3500Mpa, which is 7-9 times that of steel. The tensile elastic modulus is 23000-43000Mpa, which is also higher than that of steel.