The present invention relates to a device and a method for decanting a beverage initially contained in one or more closed bottles into smaller containers. The device comprises an enclosure under an inert atmosphere, provided with an inlet port comprising receiving means, into which inlet port the neck of the bottles is fitted, and an outlet port through which the hermetically sealed containers are evacuated. The device contains an opening station for opening the bottles fitted into the receiving means, a collection vessel that collects the liquid flowing out of the bottles, a filling station for filling the containers from the collection vessel, and a sealing station for hermetically sealing the containers. In the method, the steps of opening and emptying the bottles, and of filling and hermetically sealing the containers, are all carried out under an inert atmosphere.