Heat dissipation layer and preparation method thereof

The invention discloses a preparation method of a heat dissipation layer, which includes following steps: 1) adding graphite powder and curtain coating glue into organic curtain coating solvent, and stirring the organic curtain coating solvent to prepare sizing agent; 2) directly coating the sizing agent onto a plane needing heat dissipation in a curtain coating or coating manner; and 3) naturally drying the sizing agent on the plane and obtaining the heat dissipation layer formed on the plane. In the preparation method for the heat dissipation layer, after the graphite powder is prepared into the sizing agent, the sizing agent is directly coated on the plane needing heat dissipation in the curtain coating or coating manner, a chemical reagent treatment process and a high-temperature heating process for preparing the graphite powder are omitted in a preparation process, cost can be saved quite effectively, the preparation process is pollution-free, preparation technology is simple, and the prepared graphite heat dissipation layer is still natural. The invention further discloses the heat dissipation layer, the main ingredient of the heat dissipation layer is natural graphite, and preparation cost of the heat dissipation layer is low.