Grapheme foam and preparation method thereof

The invention discloses grapheme foam and a preparation method thereof. The grapheme foam provided by the invention is prepared by the method comprising the following steps: 1) putting a metal foam material into a vacuum tube type furnace, and calcining the metal foam material under non-oxidizing atmosphere; 2) depositing grapheme on the calcined metal foam material by adopting a chemical vapor deposition method; and 3) removing foam metal from the obtained grapheme modified metal foam material, cleaning the obtained foam material by using deionized water, ethanol and ether in turn, taking the foam material out and drying the foam material to obtain grapheme foam. The grapheme foam material has a three-dimensional hollow porous netlike structure, the grapheme is on the netlike wall, and the structural characteristic effectively prevents the agglomeration of the grapheme; and the grapheme foam material integrates the characteristics of a foam material and a conductive material, and has the advantages of ultra-low density, ultra-high surface area, high heat conduction, high temperature resistance, corrosion resistance and the like.