The invention relates to a stainless steel, a stainless steel wire for a bridge pull sling as well as preparation methods and application of the stainless steel and the stainless steel wire. The stainless steel comprises the components of less than or equal to 0.12% of C, less than or equal to 1.00% of Si, 14.0-19.0% of Mn, less than or equal to 0.06% of P, less than or equal to 0.01% of S, 18.0-22.0% of Cr, 1.0-2.0% of Ni, 0.45-0.65% of N, the balance of Fe and unavoidable impurities; and the method for producing the stainless steel comprises the steps of: the smelting process in an electric furnace: adding scrap steel and corresponding iron alloy or metal into the electric furnace, chemically cleaning, and controlling the chemical composition of crude molten steel in the electric furnace for tapping; the refining process of an argon oxygen decarburizing furnace: firstly, carrying out oxidation-period smelting and then reduction-period smelting, adding slag making material for making slag in the reduction period, and carrying out fine adjustment on the target composition by adding fine-adjustment composition alloy, and then tapping; the process of casting a billet; and the rolling process. The preparation method of the stainless steel wire for the bridge pull sling comprises the steps of: carrying out spinning, cooling, heat treatment, acid washing and cold drawing on the obtained stainless steel. The high-nitrogen stainless steel wire is adopted by the invention, so that the corrosion resistance is better when the strength is improved, and the service life of a bridge is prolonged after the bridge pull sling is made from the high-nitrogen stainless steel wire.