▎ 摘　　要

NOVELTY - The preparation device comprises reaction tank (1) fixedly installed with water spraying piece (2) on left side of outer surface close to middle position. A first connecting pipe (3) is fixedly installed on outer surface of upper end of water spraying piece close to middle position. The right end of first connecting pipe extends to the reaction tank. The left inner surface of reaction tank is provided with feeding mechanism (4) near upper end edge. The feeding mechanism accurately add chemical agent in the reaction tank. USE - The device is used for preparing graphene with approximate lattice orientation. ADVANTAGE - The preparation device realizes quantitative adding of potassium permanganate solution in reaction tank, and avoids manual adding. When the quantity is wrong, the reaction is insufficient and graphene oxide cannot be obtained, and easily cause violent reaction, which threaten safety of operator around reaction pool. The device has improved overall practicability and versatility. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the graphene preparation device. Reaction tank (1) Water spraying piece (2) First connecting pipe (3) Feeding mechanism (4) Auxiliary mechanism (5)