© RASĀYAN. All rights reserved.In this paper, we studied the phenolic content of Chamаenerion latifolium. Chamаnerion latifolium is a plant of Onagraceae L. family growing in the territory of the Republic of Kazakhstan. The extraction and identification of the phenolic compounds carried out in the water, ether and acetate phase. Qualitative and quantitative analysis of flavonoids and tannins was analyzed. Using the spectrophotometry method, the amount of quercetin flavonoids (3.32% flower, 1.48% stems, 2.48% leaf,) and tannins content (5.54% flower, stem 2.76%, leaf 4.77%) were found in the plant by standard method. Results of the study showed that the higher content of flavonoids can be found in the flowers and leaves of the Chamаenerion latifolium. The results of the study may be helpful in the isolation of flavonoids for many purposes.