The invention discloses a corrosion-resistant cable material and a preparation method thereof and relates to the field of cable materials. The corrosion-resistant cable material is prepared from 60 to70 parts by weight of polypropylene, 20 to 30 parts by weight of an ethylene-propylene-diene monomer, 15 to 22 parts by weight of glass fibers, 8 to 15 parts by weight of ultrafine diatomite, 10 to 16 parts by weight of modified basic magnesium sulfate whisker, 3 to 7 parts by weight of white carbon black, 3 to 7 parts by weight of zirconium dioxide, 1 to 3 parts by weight of polytetrafluoroethylene, 1.5 to 3.2 parts by weight of neodymium oxide, 2 to 4 parts by weight of tetrabutyl titanate, 1.5 to 2.5 parts by weight of melamine, 0.8 to 1.8 parts by weight of a beta-nucleating agent, 2.5 to4 parts by weight of a plasticizer, 0.4 to 0.8 parts by weight of a cross-linking agent, 1.5 to 2.5 parts by weight of an antioxidant and 1.5 to 2.5 parts by weight of a lubricant. Through cooperation of the cable material components, the corrosion-resistant cable material has good strength and mechanical toughness, corrosion resistance, aging resistance, high temperature resistance, high flame retardancy, no harmful smoke in burning and environmental friendliness.