The invention discloses a hot-pressed buffer sheet and a preparation method thereof. The hot-pressed buffer sheet and the preparation method thereof comprise a Teflon glass fiber cloth, an adhesive and a heat-conducting silica gel layer, and the surface of the Teflon glass fiber cloth is coated with an adhesive , the adhesive forms an adhesive layer, and the adhesive is made of the following materials in mass fraction: 30-40% of organosilicon-modified silicon resin, 30-40% of silane coupling agent, 10-20% of organic solvent and liquid resistant 10-20% warming agent, and a heat-conducting silica gel layer is arranged on the adhesive layer, and the heat-conducting silica gel layer is composed of heat-conducting silica gel with a mass fraction of 100%, 0.2-3% A / B platinum vulcanizing agent or 1-5% bis Four or 1-5% double 25, 5-30% conductive adhesive or 5-30% conductive powder, 2-5% carbon nanotubes, nano-titanium oxide and silica gel wetting agent. Through the above method, the present invention has good heat resistance, conductivity and release property, is not easy to delaminate, and has a long service life.