▎ 摘　　要

NOVELTY - A device comprises first reaction kettle (1), second reaction kettle (2), first stirrer (3), second stirrer (4), and pneumatic valve (9). USE - Device used for preparing graphene (claimed). ADVANTAGE - The method has high quality graphene and high yield. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of graphene comprising putting graphite powder and dispersant into reaction kettle, stirring, adjusting temperature of first reaction kettle, adding reaction medium, adjusting pressure, reacting with supercritical fluid, and stopping reaction; and sending into second reaction kettle, adding reaction medium, stirring, reacting with supercritical fluid, adjusting temperature, washing, and drying. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of device. First reaction kettle (1) Second reaction kettle (2) First stirrer (3) Second stirrer (4) Pneumatic valve (9)