Abstract: A method for assembling capsules for extracting beverages, the capsules including at least one main body for containing extract of a beverage, a filtering element positioned inside the main body and a base element positioned at the base of the main body; the main body, the filtering element and the base element forming at least partly the components of the capsule; the device includes a line for feeding the above-mentioned components and means for positioning the above-mentioned components along the feed line; more specifically, the feed line includes a conveyor, which moves continuously, forming a path for feeding the above-mentioned components and the positioning means are synchronised with the conveyor for assembling together the components on the conveyor.