In the inflorescences of Trifolium arvense L. were confirmed presence at least 12 flavonoid compounds. Identification of 8 isolated flavonoids was carried out by UV spectroscopy and analysis of hydrolysis products. Structure of H compound was confirmed by ¹H NMR and ¹³C NMR spectroscopy. Flavonols are represented by kaempferol 3-O-β-galactoside (H), quercetin 3-O-galactoside (E), isorhamnetin 3-O-galactoside (G), quercetin 3-O-arabinoside (D) and quercetin 3-O-xyloside (F) . Flavones are represented by luteolin (A), apigenin (C) and chrysoeriol (B) 7-O-glucosides. Identification of the next flavonoids will be possible after isolation most amounts of these compounds.