Abstract: The humic-mineral concentrate is prepared from an aqueous suspension comprising humic acid salts and finely divided humic-mineral particles and complexes the content of which ranges from 1.5 to 20 wt. % of a total weight of the salts. Electrolysis of the salts and electrophoresis of the particles and complexes are carried out in two baths in the course of which processes humic acids and humic-mineral substances making up the concentrate are isolated on the anodes. The direction of electrolyte flow in each bath is opposite to the sense of anode rotation. Interposed between the baths is a collector communicating therewith via overflow holes for feeding the aqueous suspension. Each of the bath is provided a discharge container positioned under the end product extractor.