▎ 摘　　要

NOVELTY - The preparation method of graphene involves placing insulating substrate in a mixed solution of concentrated sulfuric acid and hydrogen peroxide in a mass ratio of 3:1 and then reacting at 90 degrees C for 2 hours, washing using deionized water and then placing in aqueous solution of graphene oxide, processing the mixture and then placing in a tubular furnace, heating the mixture at 1080-1100 degrees C for 2-8 hours and then cooling to room temperature, washing the mixture using diluted hydrochloric acid and deionized water, and drying. USE - The method is useful for preparation of graphene (claimed). ADVANTAGE - The method enables preparation of graphene in simple manner.