The invention discloses a high-performance flame-retardant silicone rubber self-adhesive tape and a preparation process therefor. The high-performance flame-retardant silicone rubber self-adhesive tape comprises the following raw materials in parts by weight: 40-60 parts of silicone rubber crude rubber I, 10-30 parts of silicone rubber crude rubber II, 40-60 parts of white carbon black, 2-5 partsof structure controller, 3-5 parts of nano-scale flame retardant, 1-3 parts of heat resisting agent, 1-3 parts of tackifier, 0.01% to 0.5% of flame-retardant synergist, 0.01% to 0.3% of inhibitor and1.0% to 1.5% of vulcanizer, wherein the silicone rubber crude rubber I is methylvinyl silicone rubber and has the molecular weight of 450,000 to 600,000 and the vinyl content of 0.05% to 0.15%, and the silicone rubber crude rubber II is methylphenylvinyl silicone rubber and has the molecular weight of 350,000 to 400,000, the vinyl content of 0.1% to 0.2% and the phenyl content of 30% to 50%. The flame-retardant silicone rubber self-adhesive tape prepared by the preparation process has no need of adding a large amount of flame retardant and has the characteristics of good flame retardance, light specific weight, good fluidity, high tensile strength, good resilience, high self-adhesion, excellent electrical properties, organic solvent resistance and long shelf life and service life.