▎ 摘　　要

NOVELTY - Preparation of graphene comprises soaking graphite in acid and alkali solution, washing with deionized water to neutralized, filtering, and drying; placing in muffle furnace, heating to 800-1000 degrees C under protective gas atmosphere, and incubating for 3-5 minutes; and transferring graphite with liquid inert gas to cylinder containing liquid nitrogen or liquid hydrogen, evaporating gas, placing graphite in muffle furnace, heating to 800-1000 degrees C, taking out, cooling, and collecting solid product. USE - Method for preparation of graphene (claimed). ADVANTAGE - The method is environment-friendly, simple, and suitable for large-scale industrial production, and has wide source of raw material and low cost.