FIELD : nanotechnologies.SUBSTANCE : invention relates to the field of nanotechnology, medicine, pharmacology. Method of producing nanocapsules of diacamph in sodium alginate is characterized in that diacamph powder is used as the core of nanocapsules, and sodium alginate is used as the shell of nanocapsules, diacamph is added in portions to a suspension of sodium alginate in butyl alcohol containing the preparation E472c as a surfactant, with the 1 : 1, or 1 : 3, or 1 : 2 mass ratio of diacamph : sodium alginate, the mixture is stirred, then butyl chloride is added, the resulting nanocapsule suspension is filtered and dried.EFFECT : method for the preparation of nanocapsules diacamph in sodium alginate is proposed.1 cl, 3 ex