▎ 摘　　要

NOVELTY - A preparation method for graphene includes: an oxidation step for oxidizing graphite material to graphite oxide; a stripping and pre-reduction step for placing the graphite oxide in vacuum, protection atmosphere, reduction atmosphere or mixture of protection atmosphere and reduction atmosphere to contact with a heat source above 300 DEG C so as to make the graphite oxide form a graphite oxide having mono-layered nano-structure; a reduction and heat treatment step for placing the graphite oxide having mono-layered nano-structure in a reduction atmosphere having heat treatment temperature to lower the oxygen content of the graphite oxide having mono-layered nano-structure to 1 wt% or less; a mechanical milling and reduction step for carrying out mechanical milling and using alkaline solution as a milling liquid to sufficiently carry out dispersion and reduction, thereby obtaining a graphene.