Graphene is a kind of substance composed of carbon atoms in the form of sp ² The hybrid orbitals form a hexagonal two-dimensional carbon nanomaterial with honeycomb lattice. Graphene has excellent optical, electrical and mechanical properties. It has important application prospects in materials science, micro nano processing, energy, biomedicine and drug delivery. It is considered to be a revolutionary material in the future. Andre Geim and Konstantin Novoselov, physicists at the University of Manchester in the UK, successfully separated graphene from graphite by micromechanical stripping method, so they jointly won the 2010 Nobel prize in physics. The common powder production methods of graphene are mechanical stripping method, redox method and SiC epitaxial growth method, and the film production method is chemical vapor deposition (CVD).