▎ 摘　　要

NOVELTY - A high-quality graphene is prepared by oxidized graphite by taking 20-40 mL concentrated sulfuric acid and 1 g natural graphite, uniformly mixing at low temperature, preferably 0-25 degrees C, adding potassium permanganate at mass ratio of 1-6:1, reacting at 0-25 degrees C for 1-6 hours, heating at 30-70 degrees C, adding potassium permanganate, reacting at 30-70 degrees C for 1-8 hours, adding deionized water, hydrolyzing at 80-100 degrees C for 5-4 hours to obtain aqueous graphite oxide solution, washing with water, and drying at high temperature. USE - Method for preparing high-quality graphene (claimed).