FIELD : nanotechnology.SUBSTANCE : invention relates to nanotechnology, medicine and food industry. Method of producing nanocapsules of dry extract Rhaponticum is characterized by that dry extract Rhaponticum is added to a suspension of kappa-carrageenan in methanol in presence of 0.01 g of glycerol ester with one or two molecules of food fatty acids and one or two molecules of citric acid as a surfactant while stirring at 800 rpm, then adding methylene chloride, obtained suspension of nanocapsules is filtered and dried at room temperature, wherein weight ratio of core : shell is 1 : 1, 1 : 2 or 1 : 3.EFFECT : disclosed is a method of producing nanocapsules of a dry extract Rhaponticum.1 cl, 3 ex