The invention proposes a crack-resistant silicone rubber cable sheath material, which includes the following raw materials: methyl vinyl silicone rubber, hydrogenated nitrile rubber, chlorinated polyethylene, vulcanizing agent, accelerator, paraffin, anti-aging agent RD, Plasticizer, lubricant, carbon black, silicon micropowder, flame retardant reinforcing agent and filler; the plasticizer is composed of dibutyl phthalate and polyether silicone oil, and the flame retardant reinforcing agent is mainly composed of It is prepared from slag, nano silicon dioxide, carboxymethyl cellulose and coupling agent. Preparation method: Put the above-mentioned raw materials into the internal mixer for internal mixing, and then transfer to the open mill for thinning and rolling, put the thinned film into the three-roller sheeting machine for rolling and cutting, and open the cooling drum Cooling water, pass the cut film through the cooling drum, and then through the isolation powder tank to make a film. The anti-crack silicone rubber cable sheath material not only has good flame retardant and environmental protection performance, but also has excellent tensile strength and crack resistance.