▎ 摘　　要

NOVELTY - Preparing graphene powder comprises cracking the graphite raw material with a gas jet at 100-1000 m/second. USE - The method is useful for preparing graphene powder. ADVANTAGE - The method: is free from contamination; has high production speed. The graphene powder has high purity and good quality. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a device for preparing graphene powder comprising a raw material tank (2), a gas jet output device (4), a production chamber (5), a dust remover (6a) and an output tank (6b), where the raw material tank is provided with a pipe connected to the production chamber, the gas jet output device is provided with a pipe connected to the production chamber, the production chamber is provided with a pipe connected to the dust remover, the dust collector and the output tank are connected. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the device for preparing graphene powder . Raw material tank (2) Gas jet output device (4) Production chamber (5) Dust remover (6a) Output tank (6b)