The invention belongs to the technical field of leather products, and particularly relates to a processing technology of a leather product. The processing technology comprises the following specific steps of A1, skin selection; A2, first soaking; A3, meat removal; A4, secondary soaking; A5, first lime soaking; A6, hair removal; A7, secondary lime soaking; A8, skin planing; A9, surface cleaning; A10, lime removal; A11, cleaning; A12, airing; A13, first skin smoking; A14, first skin covering; A15, secondary skin smoking; A16, medicinal herb decocting; A17, liquid medicine applying; A18, secondary skin covering; A19, third skin smoking; A20, melanterite coating; A21, oil coating; A22, splitting; A23, first skin rolling; A24, third skin covering; A25, secondary skin rolling; A26, skin spreading; A27, trimming; and A28, numbering and warehousing. Under the premise that no chemical raw material is added, the prepared leather has breathable and waterproof characteristics, and is wear-resistant and tough.