The invention discloses a high-hardness flame retardant cable material. The high-hardness flame retardant cable material is prepared from the following raw materials in parts by weight: 20 to 30 partsof polyvinyl chloride resin, 17 to 28 parts of low density polyethylene, 10 to 20 parts of polycarbonate, 5 to 12 parts of ethylene propylene diene monomer, 6 to 11 parts of ethylene-vinyl acetate copolymer, 4 to 9 parts of maleic anhydride grafted polymer, 3 to 7 parts of aluminum hydroxide, 2 to 5 parts of zinc borate, 2 to 4 parts of antimonous oxide, 5 to 10 parts of modified kaolinite, 3 to8 parts of hydroxymethyl starch, 2 to 4 parts of a plasticizer, 1 to 3 parts of a lubricating agent, 2 to 4 parts of an ultraviolet light absorber, 1 to 4 parts of a cross-linking agent and 2 to 3 parts of a calcium-zinc compound heat stabilizer. The high-hardness flame retardant cable material has the advantages of scientific and reasonable formula, excellent flame retardancy and insulating property as well as excellent mechanical property.