The invention discloses a high temperature resistance flaming-retardant silicone rubber cable material for electric power and a preparing method thereof. The high temperature resistance flaming-retardant silicone rubber cable material for the electric power is formed by following raw materials, by weight, 120-140 parts of methyl vinyl silicone rubber, 10-20 parts of chloroprene rubber, 8-12 parts of polyethylene glycol terephthalate, 4-5 parts of tri methylol propane tri methacrylate, 8-10 parts of magnesium hydrate, 40-50 parts of dicyclohexyl terephthalate, 6-7 parts of vinyl trimethoxy silane, 4-6 parts of NDZ-401 titanate coupling agents, 6-8 parts of organic antimony stabilizer, 5-7 parts of antioxygen, 50-60 parts of nano calcium carbonate, 8-10 parts of diisooctyl phenyl phosphate, 11-13 parts of tetrabromo-bisphenol A, 6-9 parts of polyoxyethylene polyoxy hydramine amidogen ether, 6-8 parts of demethyl siloxane, 4-5 parts of antimonous oxide, 7-9 parts of calcium stearate, 7-10 parts of carbon monofluoride and 8-12 parts of nanometer titania. According to the synergistic effect of the added antimonous oxide and chlorine elements of the chloroprene rubber, the flaming retardant property of the methyl vinyl silicone rubber is enhanced, due to the added polyethylene glycol terephthalate, the diisooctyl phenyl phosphate and the tetrabromo-bisphenol A, the high temperature resistant property of the silicon rubber is improved, the wear resistant property and the machining performance are improved at the same time, and the flexibility of the cable is improved.