The invention discloses components of an anti-tensile insulated cable sheath. The components comprise chlorinated polyethylene, epichloro-hydrin rubber, magnesium oxide, zinc oxide, N,N-bis(beta-hydroxyethyl)-benzimidazolone, dibasic lead sulphate, tribasic lead sulphate, 4,4'-dioctyldiphenylamine, N-N-phenyl p-phenylenediamine, 2,2,4-trimethyl-1, N-N-dimethylaniline, trioctyl trimellitate, epoxidized soybean oil, 70# chlorinated paraffin, high abrasion furnace carbon black, antimonous oxide, gamma-mercaptopropyltriethoxysilane, trimethylol propane trimethacrylate, triallyl tricarbimide ester, triallyl cyanurate and the like. The invention further discloses a preparation process for preparing a cable sheath by virtue of the formula. The cable sheath prepared by the components and the preparation process provided by the invention has a tensile strength of greater than 12Mpa and an elongation at break of greater than 350%, the ageing performance and the wear resistance of the sheath are improved, a good weather resistance is achieved, and the volume resistivity of the material is also improved.