The invention discloses a formula of an anti-aging high-temperature-resistant cable sheath which is prepared from raw materials in parts by weight as follows: 2-20 parts of acetone, 4-20 parts of phenoxy resin, 4-22 parts of methyl vinyl rubber, 3-21 parts of modified polypropylene, 3-13 parts of an antioxidant, 2-10 parts of a compatilizer, 4-10 parts of a nucleating agent, 3-9 parts of an inorganic flame retardant, and 4-12 parts of a curing agent. The anti-aging high-temperature-resistant cable sheath has the advantages of good anti-aging effect, good shielding property, long service life and the like.