The group of inventions relates to the technology for purifying liquids and gases by removal of contaminating multicomponent ingredients. The device comprises a housing comprising at least one hollow spiral element with a conical shape, with separation openings being formed in at least some of the turns of the spiral element, each of the openings communicating with a corresponding separation chamber. Arranged opposite the separation opening is a nozzle, which is intended for compensating for the mass and centrifugal moment of the fluid medium. A guide element around which a flow passes is mounted on the wall of the nozzle. The cross-sectional area and the radius of each successive turn is selected from the condition for maintaining an estimated value for the centrifugal moment of the substance to be purified. The method consists in that a flow of medium to be purified is spun by the above-described device. Contaminating components in each turn are positioned by coaxial layers. Layer-by-layer removal of the contaminating components via the separation openings is performed. A reduction in the centrifugal moment of the flow to be purified is compensated for by a clean layer of fluid medium being injected. Technical result: as complete purification of fluid media as possible.