After desorption of gold from different sorbents, saturated solutions in which non-ferrous metals eluate simultaneously with gold are obtained. During the electrolytic reduction of gold these metals pass into a cathode deposit and contaminate it. In the present work the electrolyte purification from impurities of non-ferrous metals is performed by the addition of hydrogen peroxide in the solution. As a result, non-ferrous metals precipitate in the form of slightly soluble compounds while gold remains in the solution which is transmitted for the electrolytic production of the metal. It was established that the extraction of the impurities of non-ferrous metals from the electrolyte solution increases as the temperature and the oxidizing agent consumption increase.