FIELD : nanotechnologies. SUBSTANCE : invention relates to the field of nanotechnology, in particular, to a method for producing nanocapsules, and describes a method for producing nanocapsules of tannin in a shell of guar gum. Method is characterized by the fact that in the suspension of the guar gum in butanol in the presence of 0.01 g of E472c with stirring 1, 000 rpm, diethyl ether is then poured, the resulting nanocapsule suspension is filtered and dried at room temperature, with the core : shell mass ratio being 1 : 1, or 1 : 2, or 1 : 3. EFFECT : method ensures the nanocapsules producing process simplification and acceleration, reduction in losses during the nanocapsules production, and can be used in the pharmaceutical and food industries. 1 cl, 3 ex