▎ 摘　　要

NOVELTY - A graphene is prepared by reacting carbon nanotube and oxidant with ionic liquid under normal dispersion mode at 0-300 degrees C for 0.1-48 hours. USE - Method of preparing graphene (claimed). ADVANTAGE - The method is simple, easy for operation, and suitable for large-scale industrial production; and has widely distributed materials, non-corrosive reaction medium and recyclable medium, high yield, mild reaction condition under normal pressure and low energy consumption.