The invention discloses a fire-resistant silicon rubber self-adhesive tape and a preparation method thereof, belonging to the field of high-polymer materials. The fire-resistant silicon rubber self-adhesive tape mainly comprises the following components and materials in parts by weight: 100 parts of methyl vinyl silicone rubber, 15-40 parts of white carbon black, 5-20 parts of alumina, 1-4 parts of constitution controller, 1.5-3 parts of sintering additive, 0.15-1 part of surface treating agent, 0.5-2 parts of cross-linking agent, 0.5-1 part of superfine polytetrafluoroethylene powder, 0.5-2 parts of boric acid ester, and 0,5-2 parts of tackifying resin. In the fire-resistant silicon rubber self-adhesive tape, a ceramic protection layer is formed on the silicon rubber through the co-sintering of the white carbon black, alumina and sintering additive, the ceramic body is stable in structure, strong in adhesive force, high in hardness, difficult to fall, and good in compactness, difficult for formation of a channel so as to play a role in isolating flame, and capable of being widely applied to repair and connection of processed wires and cables, as well as convenient to use and excellent in insulating property.