▎ 摘　　要

NOVELTY - The preparation method involves providing a plasma electrolytic apparatus, in which a basic electrolytic solution (3) is provided and a graphite electrode is configured as a cathode (1) of the plasma electrolytic apparatus. A cathodic current is applied so as to initiate a plasma electrolytic process at the surface of graphite electrode that have been in touch with the electrolyte to obtain graphite oxide and/or graphene. The anode (2) of the plasma electrolytic apparatus is not made of aluminum, magnesium, or titanium. USE - Preparation method of graphite oxide and/or graphene used as nanomaterial in field of e.g. optoelectronics, energy, chemical material. ADVANTAGE - Implements a plasma electrolytic process and ultrasonic oscillations to produce graphite oxide in a relatively low temperature, pressure and within a very short time, and does not require concentrated strong acids and oxidizing agents. Achieves plasma electrolytic process that is an effective method for graphite oxide production by the exothermal effect by vapor plasma envelope. The graphite electrodes can be used without any prior purification, to enable use of different kinds of materials such as recycled graphite electrodes, to achieve reduced cost, easy, efficient and environment-friendly preparation. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of the plasma electrolytic apparatus. Cathode (1) Anode (2) Electrolytic solution (3) Thermometer (4) Ultrasonic vibrator (5)