FIELD: oil refining and petrochemistry, particularly, processing of spent aluminium oxide based catalysts comprising platinum and/or palladium. SUBSTANCE: described is method of extracting platinum and/or palladium comprising treating spent platinum and palladium catalysts, after precombustion of coke in air heated to 400-600 C, with alkali solution with concentration of at least 40 wt.% in autoclave at 140-200 C, introducing additives from aqueous solutions of hydroxyamine, aluminium nitrate, alcoholic solution of isobutyl alcohol at 1-2:1-2:1 ratio of 0.5-2 wt.% of catalyst. EFFECT: increased extraction of platinum and/or palladium. 2 cl, 20 ex, 1 tbl
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