In　order　to　address　the　global　challenges　of　sustainability　of　marine　concrete　structures　while　improving　the　durability　of　marine　renewable　energy　infrastructure,　this　paper　is　the　first　to　investigate　the　degradation　of　the　axial　compressive　properties　of　profiled　steel　reinforced　concrete　(SRC)　structures　in　wind　turbine　towers　under　chloride　salt　attack.　To　study　the　effects　of　different　chloride　ion　concentration,　corrosion　duration,　corrosion　current　and　slenderness　ratio　on　the　failure　mode　and　performance　degradation　of　steel　reinforced　concrete　columns　under　axial　compression,　twelve　SRC　composite　long　column　specimens　were　designed,　and　corrosion　test,　axial　compression　test　and　numerical　analysis　were　carried　out.　Based　on　Mander　confined　concrete　constitutive　model,　the　calculation　formula　of　compressive　strength　of　SRC　columns　under　different　confined　stresses　is　proposed,　and　the　theoretical　prediction　model　and　numerical　analysis　model　of　chlorine　erosion　bearing　capacity　of　corroded　SRC　composite　long　columns　are　established,　and　the　extended　parameter　analysis　is　carried　out.　The　research　results　can　effectively　guide　the　performance　evaluation　of　SRC　structures　in　wind　turbine　towers　under　coastal　hygrothermal　coupling.