The invention discloses a high-temperature-resistant halogen-free flame-retarding thermoplastic elastomer. The high-temperature-resistant halogen-free flame-retarding thermoplastic elastomer is prepared from the following raw materials in parts by weight: 60 to 80 parts of EVA (Ethylene-vinyl Acetate copolymer), 25 to 45 parts of EPDM (Ethylene-Propylene-Diene Monomer), 15 to 35 parts of an ethylene-octene copolymer, 1 to 15 parts of high density polyethylene, 5 to 20 parts of organic modified siloxane, 10 to 30 parts of ammonium polyphosphate, 2 to 5 parts of aluminum hydroxide, 1 to 3 parts of zinc borate, 1 to 5 parts of sulfur, 0.5 to 1.5 parts of an accelerant TMTD (Tetramethylthiuram Disulfide), 0.5 to 2 parts of an accelerant CZ, 0.5 to 2 parts of zinc oxide, 1 to 3 parts of an anti-ageing agent RD, 4 to 18 parts of calcium carbonate, 3 to 5 parts of ground quartz, 5 to 10 parts of an interface compatibilizer, 5 to 20 parts of a plasticizer, 0.5 to 2 parts of an antioxygen, 0.2 to 2 parts of a lubricant and 1 to 3 parts of a processing auxiliary agent. The thermoplastic elastomer disclosed by the invention has excellent high-temperature resistance and flame-retarding performance and has no halogen, low toxin and good comprehensive properties.