Heat insulation composite cable

The invention discloses a heat insulation composite cable which comprises a plurality of conductors and an optical unit, the conductors and the optical unit are stranded together, an insulating sheath is arranged on the outer side of each conductor, and an optical unit sheath is arranged on the outer side of each optical unit. The optical unit sheath is prepared from the following materials in parts by weight: 72 parts of ethylene-vinyl acetate copolymer, 16 parts of linear low-density polyethylene, 12 parts of ethylene propylene diene monomer, 1 part of vinyltriethoxysilane, 1.5 parts of didodecyl thiodipropionate, 1.6 parts of silicone master batch, 3.5 parts of lead oxide powder, 4 parts of ethoxylated trimethylolpropane triacrylate, 2 parts of N, N, N ', N'-tetramethyl-1, 3-pentanediol monoisobutyrate, 2 parts of a coupling agent and 2 parts of a coupling agent. 1.2 parts of N, N '-tetra [4-(dibutylamino) phenyl]-1, 4-phenylenediamine hexafluoroantimonate, 0.8 part of diphenylguanidine, 1 part of lauryl s