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Purpose. To study the effect of preliminary electric discharge treatment on the efficiency of bleaching of coarse pigmented wool. Methodology. Standardized methods for studying the physicochemical properties of wool fibers have been applied. Findings. The results of the study of the influence of the main technological parameter of the process of mordant peroxide bleaching on the whiteness and the degree of damage of wool keratin are given and the optimal concentration of the catalyst is determined. An improvement in the physical and mechanical properties of bleached coarse pigmented fiber after electric discharge treatment has been established. Originality. It is proved that the use of electric discharge treatment allows to maximally preserve the strength properties of wool fiber in the process of mordant peroxide bleaching. Practical value. The obtained results create prerequisites for expanding the domestic raw material base of the woolen textile industry through the use of an innovative method of modifying coarse pigmented wool. [ABSTRACT FROM AUTHOR]