▎ 摘　　要

NOVELTY - Device comprises a tank body and a fixing support are connected to the bottom of the tank body of the bottom. The tank body is set with a through hole; further set at the bottom of the support of the working electrode substrate, passes through the through hole and is vertically and fixedly arranged glass tube of the glass tube on the working electrode substrate. The contact surface of the work electrode plate is set with a porous separator. The graphite is placed in the bottom of the glass tube and the porous separator and the working electrode substrate is contacted with the top part of the graphite is set with glass fiber filter membrane. The upper surface of the glass fiber filter membrane is set with a gravity press extends through the through hole of the glass tube. The device further comprises a reference electrode and a counter electrode. The reference electrode through gravity press top part inserted into the bottom. The pair of electrodes is connected with the gravity press. USE - The device is useful for preparing graphene (claimed). ADVANTAGE - The device is safe and environmentally friendly. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing graphene using device (S1) Placing graphite particles on the bottom of the glass tube above the working electrode substrate and below the gravity extruder, (S2) pressing the graphite particles against the working motor substrate by applying gravity on a support plate on the gravity extruder, (S3) adding water-soluble acidic electrolyte to the empty tube to immerse the graphite particles, and (S4) gravity extrusion of the graphite material in the application of a constant current and a holding reaction to the working motor substrate and the counter electrode. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the device.