A horizontal cutter of double-bodied bottles attached to each other at a neck which comprises means (2) for advancing the bottles (3) and a cutting device (1) of the neck of the bottles. The cutting device (1) comprises a pair of blades (7), a pair of rotating plates (4) for drawing the bottles (3) along and a plurality of drive pulleys (9) in contact with the bottles (3), in such a way that as the rotating plates (4) move so do the bottles, at the same time rotating about their axes and in contact with the blades. The horizontal cutter ensures fast and effective cutting of the bottles, while occupying little space.