The invention discloses a high-temperature-resistant moisture-proof mould-proof environment-friendly cable material and a preparation method thereof. The cable material is composed of a mixture A and a mixture B, wherein the mixture A comprises, by weight, 30-40 parts of high-density vinyl resin, 20-30 parts of polyacrylate, 25-35 parts of maleic anhydride grafted poly ethylene, 20-30 parts of methyl vinyl silicon rubber, 1-3 parts of semi-reinforcing carbon black, 40-60 parts of light calcium carbonate, 1-3 parts of N, N'-m-phenylenedimaleimide, 1.5-2.5 parts of aniline-methyl-triethoxysilane, 1-3 parts of calcium stearate, 3-4 parts of antioxidant DSTP and 10-20 parts of mica powder; the mixture B comprises, by weight, 50-70 parts of chlorinated polyethylene, 30-40 parts of poly(styrene-butadiene-styrene), 20-30 parts of ethylene-ethyl acetate copolymer, 0.3-0.5 part of poly(4-methyl-1-pentene), 1-3 parts of antiager TPPD, 2-4 parts of polyethylene wax, 5-10 parts of polycaprolactone, 2-3 parts of sodium dibutyl naphthalene sulfonate, 1-3 parts of superfine polyvinyl alcohol, 2-4 parts of isooctyl thioglycolate dimethyl tin and 10-15 parts of zinc borate. The preparation method is simple, and the cable material has excellent electric performance, good physical mechanical performance and meets requirements of temperature change of different environments.