The invention belongs to the storage technical field of a material used for measuring the oxygen content in metal, in particular relates to a storage method of a nickel basket used for measuring oxygen content. The method comprises the following steps: using analytically pure phosphoric acid, glacial acetic acid and nitric acid as raw materials to prepare a mixed acid solution, weighting a certain mixed acid solution of which volume ratio to the nickel basket is 1:1-3:1, heating in a water bath or on a asbestos wire gauze for 25-100s, wherein the temperature of the water bath is 60-85 DEG C; washing the nickel basket cleanly with water and absolute alcohol, air-drying with warm wind; and filling inert gas in a reagent plastic bottle and loading in the nickel basket which is treated by mixed acid to store in a sealing environment. The corrosive effect of the nickel basket which is treated by the method of the invention is good, the obtained oxygen content is low and stable, the uniformity of the oxygen content of the treated nickel basket is high and the range is small. The oxygen content of the nickel basket stored by using the storage method of the invention is basically unchanged in several weeks.