▎ 摘　　要

NOVELTY - Preparing graphene comprises introducing methane having purity of greater than or equal to 99% into the electric field, carrying out ionization and re-nucleation, gas-solid separating and cooling to obtain final product, where the electrode distance is 0.02-3 mm in electric field and the operating voltage is 300-8000 V generated electric field. USE - The method is useful for preparing graphene. ADVANTAGE - The method has simple process, and high quality.