Graphene preparation method

The invention discloses a preparation method of graphene. The preparation method comprises a preparation method. Relates to the technical field of graphene preparation. The method comprises the following steps: processing and purifying carbon to obtain carbon powder particles, and carrying out primary incomplete oxidation reaction, primary cooling, secondary incomplete oxidation reaction and secondary cooling on the carbon powder particles by using a vortex boiler to prepare graphene. In the process, on one hand, the electrifying voltage of the vortex type boiler is controlled, the boiler temperature is changed through the Joule heating effect, the boiler is cooled through circulating cold water, and temperature control operation is achieved; on the other hand, the furnace cover is controlled to realize incomplete oxidation operation of the carbon powder particles; in the process, the pollution is low, and the energy consumption is low. The method has the advantages of simple operation and few steps, effectiv