▎ 摘　　要

NOVELTY - A preparation method of nitrogen-doped graphene includes providing a plasma electrolytic apparatus, where a nitrogen-containing electrolyte is provided and a graphite electrode is configured as a cathode of the plasma electrolytic apparatus; and providing a cathodic current so as to initiate a plasma electrolytic process at the graphite electrode to obtain nitrogen-doped graphene. The nitrogen-doped graphene can be synthesized through plasma electrolytic process with nitrogen-containing electrolyte at relatively low operational voltage under ambient conditions within a very short period of time.