The invention discloses an outdoor overhead 
ageing-resistant insulating 
polyolefin cable material and a preparation method thereof. The outdoor overhead 
ageing-resistant insulating 
polyolefin cable material comprises, by weight, 60-80 parts of 
ethylene-
vinyl acetate copolymer, 30-40 parts of chlorosulphonated 
polyethylene, 4-6 parts of 
isopropyl phenyl 
diphenyl phosphate, 4-5 parts of acetyl tri-n-butyl citrate, 8-10 parts of 
magnesium hydroxide, 40-50 parts of di-iso-decylphthalate, 6-8 parts of butadiene triethoxy 
silane, 2-4 parts of organic 
chromium complex, 6-8 parts of 
lead sulfate tribasic, 5-7 parts of p-phenylenediamine, 30-40 parts of nano 
calcium carbonate, 6-10 parts of beta-
diketone, 12-14 parts of 
ammonium polyphosphate, 7-8 parts of 
silicone emulsion, 5-7 parts of fluoro-
alkyl polyether modified polysiloxane, 7-9 parts of 
zinc stearate, 5-8 parts of nano 
calcium superoxide, 6-9 parts of paraffin and 8-12 parts of hexadecyl dimethyl amine. According to the outdoor overhead 
ageing-resistant insulating 
polyolefin cable material and the preparation method thereof, the added di-iso-decylphthalate 
plasticizer and the 
ethylene-
vinyl acetate copolymer are matched, in this way, the 
aging resistance is improved, the processability is also improved, and the flexibility of a cable is improved; meanwhile, the 
ammonium polyphosphate has the condensation and phase neutralizing functions, and an 
extremely good frame retardant effect is achieved through the combination of the 
ammonium polyphosphate and the 
magnesium hydrate; the added chlorosulphonated 
polyethylene has the 
wear resistance, electric 
insulation resistance and other characteristics.