A plant of the genus Bupleurum L. is being introduced into medical practice and being used in traditional medicine as an anti-inflammatory agent in diseases of the gastrointestinal tract, treatment of diseases of the liver and gall bladder. In folk medicine, infusionfrom the herb Bupleurum scorzonerifolium Willd. is used externally for inflammatory diseases of the eyes and skin diseases. B. scorzonerifolium is widespread and abundantly grows in the area of Ural Mountains, Altai, Tuva, in the Krasnoyarsk region, Baikal region, and Buryatia. Detection of phenolic compounds in B. scorzonerifolium was performed using qualitative analytical reactions. Studying the composition of flavonoids and phenol carbonic acids was carried out by paper chromatography. We established that the leaves of B. scorzonerifolium contain quercetin, kaempferol, rutin, hyperoside and isorhamnetin, stems - quercetin, kaempferol, rutin and isorhamnetin, flowers - quercetin, hyperoside and rutin. The leaves, flowers and stems found to contain caffeic, chlorogenic and ferulic acids. The quantitative content of tannins was determined by permanganometry method, flavonoids and phenol carbonic acids -by spectrophotometric method. The maximum quantity of phenolic compounds is detected in leaves and flowers. Thus, as a medicinal plant, the grass B. scorzonerifolium can be recommended for harvesting during the flowering period.