The present application relates to a device for disinfecting liquid by ultraviolet radiation, comprising at least one source of ultraviolet radiation primary disposed in the outer periphery of a portion of the cylindrical duct (50) is configured to that of the liquid to flow, and at least one tube (81) extending the pipe section (50) and extending from at least one outlet (56) of the pipe section (50) up to at least one point of distribution (62) of the device. The pipe section (50) and at least one source of ultraviolet radiation are configured so that the at least an ultraviolet radiation source irradiates the pipe section (50) and the liquid flowing in the pipe section (50) from the outside of the pipe section (50), and the tube (81) is configured in order to guide the ultraviolet radiation coming from the pipe section (50) as far as the point of distribution (62).
