Purpose of the research work. This is a study of the phenolic content of raw materials of T.grossheimii , which is widespread in the flora of Azerbaijan. Material and methods. T.grossheimii raw materials used for research purposes were collected on the territory of the Nakhchivan Autonomous Republic of Azerbaijan during the flowering phase of the plant in 2022. The composition of phenolic compounds of raw materials was studied by high-performance liquid chromatography. The results have been received. The optimal chromatographic conditions for the analysis of the phenolic content of T.grossheimii raw materials using high-performance liquid chromatography were determined as follows: brand C-18 (Discovery), chromatographic column measuring 4.6x250 nm; Mobile phase: acetonitrile-water-orthophosphoric acid (40:60:0.5); Mobile phase speed - 0.9 ml/min; Thermostat temperature 25°C; injection volume of the test sample – 3 µl; analysis time - 50 minutes. As a result, 16 substances related to phenolic compounds were identified in the raw materials. The main components of the raw material are fumaric acid, rosmarinic acid, chlorogenic acid, quinic acid, ferulic acid and quercetin. Conclusion. Thus, T. grossheimii raw material was found to be rich in phenolic compounds, which shows the promise of extensive pharmacochemical studies of the raw material.