FIELD: machine building and metal working industries. SUBSTANCE: claimed method comprises deemulsifying oils with iron and calcium hydroxide based suspension resulting from purification of electroplating sewage in amount of 0.5-10 parts of dry residue per 1 part of emulsified petroleum product followed by electrocoagulation at current density of 60-200 A/sq.m for 10-15 minutes using soluble anodes or galvanic couple. In order to activate residues, 5-20 wt % calcium hydroxide per dry residue are added to said residues. EFFECT: more efficient purification. 3 cl, 1 tbl
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