The utility model relates to a steel strand external stay cable 
structure system for a wind 
tower. The steel strand external stay cable 
structure system comprises a steel strand stay cable, an isolation and anti-wear device, a constraining and shock absorption device and a basic conversion bracket 
assembly; the isolation and anti-wear device comprises an anti-wear sleeve 
pipe, isolation sleeves and a 
thermal shrinkage sleeve, the anti-wear sleeve 
pipe sleeves the stay cable, and the isolation sleeves are arranged at several points of an excircle steel strand and are fixed by the 
thermal shrinkage sleeve; the constraining and shock absorption device comprises two half clamping plates and a hinged damping rod; in an installation state, the basic conversion bracket 
assembly is pre-buried and poured in 
tower foundation concrete, and the upper end of the steel strand stay cable is locked at a platform base plate at the top of the 
tower by an upper anchor 
assembly, and the 
tail end of the cable body of the steel strand stay cable end penetrates to a support cylinder hole of the basic conversion bracket assembly and is anchored by a tension end anchor assembly; the isolation and anti-wear device is positioned at a tower top corner structure; and the constraining and shock absorption device is installed at a laying-off position of a tower 
barrel and the steel strand stay cable. The steel strand external stay cable 
structure system is conducive to the installation and construction of a tower top narrow space structure, 
seismic resistance is good, the quality of the stay cable construction is ensured, and the service life is prolonged.