The invention discloses a modified silicone rubber electric cable accessory. The modified silicone rubber electric cable accessory comprises, by weight, 90 to 100 parts of silicone rubber, 2 to 5 parts of dicumyl peroxide, 1 to 4 parts of dibenzoyl peroxide, 20 to 35 parts of rubber oil, 5 to 11 parts of methyl vinyl silicone oil, 5 to 10 parts of carbon fiber, 30 to 36 parts of carbon black, 1 to1.2 parts of graphite, 10 to 15 parts of alumina, 95 to 110 parts of silicon carbide, 1 to 3 parts of barium titanate, 1 to 2 parts of diatomite, 1 to 2 parts of quartz powder, and 30 to 40 parts ofwhite carbon black. The modified silicone rubber electric cable accessory is prepared through appropriate adding of different reinforcing filling materials, so that the dielectric constant of siliconerubber is increased, the dielectric constant loss is small, the maerial mechanical properties, thermal conductivity, and thermal stability are improved, material decomposition speed is reduced, silicone rubber performance is improved overall, and the weakness is reduced.