▎ 摘　　要

NOVELTY - Preparing graphene, comprises (1) crushing or cutting plastic product, and ball milling to obtain plastic pieces, (2) subjecting the plastic pieces to high temperature carbonization under vacuum condition, and ball milling the resulting carbonized powder block to obtain carbonized powder, (3) under vacuum condition, introducing reduction gas and protective gas into carbonized powder, then carrying out calcination, and (4) washing calcined powder, then purifying and drying. USE - The graphene is useful for preparing conductive materials, paints, heat dissipation structure and solid propellants. ADVANTAGE - The graphene: has low cost, controllable layer number, large specific surface area, and high conductivity; and is environmentally friendly. The method: has low preparation cost; and is suitable for large scale industrial production. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for graphene obtained by above mention method.