The utility model relates to a long -life electric wire for building, include: by conductive core and the outer wrap -around insulating layer that many copper wire transposition formed, conductive core is formed by 7~61 copper wire transposition, and the material radiation cross -linking polyolefin of insulating layer includes following weight account's component: ethylene the vinyl acetate copolymer is 55~65, high density polyethylene 18~25, magnesium hydroxide 30~50, red phosphorus is 12~16, the nanometer imvite is 12~18, the stearic acid is 0.1~2, the silicone is 2~5, anti -oxidant is 1, 010 0.4~6, anti -oxidant DLTP is 0.4~6, three rare propyl isonitrile urea acid esterss are 1~10, two tert -butyl group peroxide 0.1~1, the utility model discloses an electric wire has that ageing performance is splendid, life speciality, better, the more high characteristics of factor of safety of mechanical property.