The invention discloses a corrosion-resistant insulated cable material and a preparation method thereof. The corrosion-resistant insulated cable material comprises the following raw materials in parts by weight: 70-90 parts of polyurethane rubber, 1-20 parts of a mica powder, 6-12 parts of nylon, 10-15 parts of alkali-free glass fiber yarn, 5-10 parts of dipropylene glycol dibenzoate, 5-10 parts of HRB-6 resin, 7-13 parts of magnesium hydroxide, 4-8 parts of aluminum hydroxide, 2-3 parts of tert-butyl peroxybenzoate, 1.5-2 parts of zinc oxide, 2-3 parts of stearic acid, 3-6 parts of chlorinated paraffin, 15-20 parts of fumed silica, 10-15 parts of nano attapulgite, 10-15 parts of precipitated barium sulfate, 1.5-2.5 parts of an antioxidant, 2-3 parts of an anti-aging agent TPPD, 3-6 parts of composite fillers, 1-2 parts of an accelerator ZDMC and 1-2 parts of an accelerator CZ. The cable material provided and prepared in the invention has high wear resistance, also has high heat resistance, high flame retardancy, high aging resistance, high oil resistance, high flexure resistance, high impact resistance and high tear resistance, is durable in use, and can fully meet performance requirements of modern wires and cables.