▎ 摘　　要

NOVELTY - Preparing a graphene comprises (i) taking graphite, potassium permanganate and sulfuric acid and mixing uniformly, stirring while reacting at 0-100 degrees C for 10-120 minutes, adding water and hydrogen peroxide solution, stirring while reacting for 1-15 minutes and performing solid-liquid separation to obtain intercalated graphite; and (ii) dispersing the intercalated graphite in water and placing in a microwave reactor, charging with protective gas, performing microwave reaction for 1-15 minutes and performing solid-liquid separation. USE - The method is useful for preparing a graphene. ADVANTAGE - The method produces graphene in large scale, has simple process, short flow, mild reaction conditions, low cost, easy mass production, excellent graphene performance, less structural defects and has good quality stability between batches.