▎ 摘　　要

NOVELTY - The preparation method involves performing (101) a pyrolysis and condensation on the biomass waste to obtain activated carbon. The secondary pyrolysis and condensation to portion of the activated carbon is carried out (102) to obtain graphitic carbon, a second oil phase product and a second gas phase product. The first gas-phase product and the second gas-phase product is passed (103) into the remaining activated carbon for gas-phase deposition to obtain graphene-loaded activated carbon and the first mixed gas. The pyrolysis of plastic waste is configured to obtain (104) oil and gas products. The oil and gas product is passed (105) into the graphitic carbon for vapor phase deposition to obtain graphene-loaded graphitic carbon and a second mixed gas. The graphene is obtained (106) based on the graphene-loaded activated carbon, the graphene-loaded graphitic carbon, and the second mixed gas. USE - Preparation method of graphene. ADVANTAGE - The method is cheap biomass waste and plastic waste as raw material to graphene, so it not only can realize changing waste into valuable, but also can save the traditional preparation graphene the fossil resource used by the technology. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a preparation system of graphene. DESCRIPTION OF DRAWING(S) - The drawing shows a flowchart illustrating the preparation method of graphene. (Drawing includes non-English language text) 101Step for performing a pyrolysis and condensation 102Step for carrying out secondary pyrolysis 103Step for passing the first gas-phase product 104Step for obtaining oil and gas products 105Step for passing the oil and gas product into the graphitic carbon for vapor phase deposition 106Step for obtaining graphene