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The present invention provides a method for effectively and economically recovering rare-earth metals from manganese nodules existing in open waters. More particularly, provided is a method for extracting rear-earth metals at a low concentration and at a low temperature by using a sulfuric acid solution of a leachate passage. According to the present invention, the present invention will make a large contribution to stably providing rear-earth metals in the future by recovering rear-earth metals from manganese nodules whose reserves are sufficient.COPYRIGHT KIPO 2014