The invention discloses an anti-cracking silicone rubber cable material and a preparation method of the material. The anti-cracking silicone rubber cable material is prepared by the following raw materials in parts by weight: 65-75 parts of methyl vinyl silicone rubber, 20-30 parts of nylon 66, 10-15 parts of isotactic polypropylene, 15-20 parts of magnesium hydrate, 5-10 parts of sodium molybdate, 8-12 parts of melamine cyanurate, 2-3 parts of magnesium oxide, 10-15 parts of diisononyl phthalate, 1.5-2.5 parts of methyl tin mercaptide, 5-8 parts of polyethene wax, 0.5-1.5 parts of antioxidant BHT (butylated hydroxytoluene), 0.8-1.2 parts of valcanizer DTBP (di-t-butyl peroxide), 1-2 parts of accelerator TETD (tetraethylthiuram disulfide), 0.5-1.5 parts of scorch retarder CTP (cytidine triphosphate), 15-20 parts of carbon black N660, 12-18 parts of vermiculite powder, 5-10 parts of nano aluminum oxide and 4-7 parts of composite packing. The cable material has excellent cracking resistance and mechanical properties, is free from cracking in a low temperature impact test at -30 DEG C, a high temperature impact test at 120 DEG C and a bending test, can be applied to harsh environments such as low temperature, salt mist, wetness, hot and mould, and is durable in use.