▎ 摘　　要

NOVELTY - Preparing graphene-metal composite material comprises (i) dissolving the polymer template material in solvent to prepare template liquid, drying and forming film to obtain carrier film, (ii) placing in the liquid metal element containing target metal elements indium, carrying out metal load, drying to obtain the precursor film, and (iii) performing laser treatment to the precursor film. USE - The method is useful for preparing graphene-metal composite material. ADVANTAGE - The method provides a new way of thinking about the utilization of chitosan and its derivatives and industrial wastewater, achieves an effective use of chitosan and its derivatives, achieves wastewater purification through its inherent purification and adsorption properties, and the purified discarded materials are used for the second time and transformed into high-value products, has obvious beneficial effects for improving the economic benefits generated in the material cycle and promoting the development of the environmental protection industry, and has obvious promotion value. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for graphene-metal composite material prepared according to above mentioned method.