A method for the leaching of precious metal from manganese nodules by using steel pickling waste solution is provided to improve the leaching reaction speed of precious metal by Fe^2+ contained in steel pickling waste solution by using the waste solution instead of using hydrochloric acid solution at low cost. A method for the leaching of precious metal from manganese nodules includes the steps of crushing manganese nodules into the particle size of 10 mm or less, carrying out leaching by using steel pickling waste solution of 25°C or higher for 15minutes or longer, and obtaining filtrate containing precious metal by filtering insoluble residues.
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