▎ 摘　　要

NOVELTY - A graphene preparing device comprises graphene reaction chamber (6) provided with reactant-bearing heating plate (5) and electric field generating device; plasma chamber (10) arranged on one side of graphene reaction chamber, and provided with magnetic field generating device; and plasma jet orifice (1) located at one end of plasma chamber for injecting mixed plasma. The injection direction of mixed plasma is same as extending direction of reactant. The direction of accelerating electric field generated by electric field generating device, direction of screening magnetic field generated by magnetic field generating device and extension direction of reactants are perpendicular to each other. USE - Graphene preparing device. ADVANTAGE - The device uses screening magnetic field to screen argon ion and hydrogen ion, thus avoiding argon ion bombardment and etching effect of graphene oxide. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing graphene. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of the graphene preparing device. Plasma jet orifice (1) Reactant (4) Reactant-bearing heating plate (5) Graphene reaction chamber (6) Plasma chamber (10)