Abstract: The data on the study of the amino acid, fat-acid, carbohydrate and vitamin composition of the plant Elaeagnus angustifolia L. are presented. The study of the amino acid composition shows that among the studied amino acids, the main ones are glycine, asparagine, proline, cysteine and tyrosine. The high concentration among fatty acids is defined for oleic (23,6%), linoleic (67,5%), myristic (5,1%) and palmitic (1,8%) acids. The study of the qualitative and quantitative monosaccharide composition showed that 27,37% of fructose and 35,44% of glucose are predominant in the water-soluble polysaccharide complex. The water-soluble revealed quantitative vitamin content showed B6 (68,78 mg/%) and B9 (232,3 mg/%).