▎ 摘　　要

NOVELTY - The device has an electrolytic cell (1), an electrolytic cell cover (2), a power source (3) and an electrolyte (4). The electrolytic cell cover is detachably installed on the electrolytic cell. The main portion includes first anode (5) and a first cathode (6), and a second anode (7) and a second cathode (8). The first cathode is a carbon rod, and the first anode and the first cathode are respectively connected to the positive electrode and the negative electrode of the power source. The second anode and the second cathode are sequentially connected in series between the first cathode and the first anode. The first anode, the second anode and the second cathode are all high-purity metals, and the second anode and the second cathode are the same or different high-purity metals. The dissolution voltage of the first anode is greater than the dissolution voltage of the second anode. USE - Gradient electric field synthesis device of metal-graphene composite material. ADVANTAGE - The device is simple and cheap, and the operation is easy and convenient. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing metal-graphene composite material. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the gradient electric field synthesis device. Electrolytic cell (1) Electrolytic cell cover (2) Power source (3) Electrolyte (4) First anode (5) First cathode (6) Second anode (7) Second cathode (8)