▎ 摘　　要

NOVELTY - The high-efficient preparation method of carbon nanotube or graphene involves weighing reduction catalyst and then activating, carrying out carbonization reaction, placing in a conventional fluidized bed reactor and then processing, carrying out carbonization reaction using a carbonization reactor, placing in a circulating fluidized bed and then circulating, and sedimenting. USE - The method is useful for high-efficient preparation of carbon nanotube or graphene (claimed). ADVANTAGE - The method enables preparation of carbon nanotube or graphene with high efficiency.