Preparation method of carbon material

The invention provides a preparation method of a carbon material, and belongs to the technical field of chemical engineering and materials. Comprising the following steps that in an oxygen-free environment containing a carbon source and a catalyst, voltage is applied to a conductive medium to form a conductive path, the carbon material is obtained, and the conductive medium comprises a solid substrate or a liquid-phase conductive system; when the conductive medium is a liquid-phase conductive system, the carbon material is obtained in the liquid-phase conductive system; and when the conductive medium is a solid substrate, obtaining the carbon material on the surface of the solid substrate. The carbon material is prepared by adopting a conductive path, the preparation process is simple, the energy consumption is low, the cost is low, the requirement on equipment is low, and the preparation of the carbon material can be realized at normal temperature. Furthermore, different types of carbon materials including g