FIELD: manufacture of humic acids, ecology and agriculture. SUBSTANCE: method is based on oxidation of combustible resources which is carried out in aqueous solution containing 0.5-3.84 moles of nitric acid and 0.5-1.44 moles of sulfuric acid or 0.5 mole of hydrochloric acid in 1 l. Process is carried out at L:S ratio of (2.5-10):1 at temperature of 10-90 C to recover desired product sediment from reaction mixture. Original raw materials include peat, lignite and coal. Method makes it possible to attain high yield of product and to effectively convert carbon-containing components of raw materials and humic acids. EFFECT: more efficient preparation method. 4 cl, 3 ex, 1 tbl
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