The invention relates to a foldable and stackable bathroom cabin having multiple purposes such as a dressing room and a storage room, as toilet and shower; which can be connected directly to the waste discharge network. It is equipped with four telescopic columns, foldable in sections controlled by means of casings, with securing mechanisms ending in the corresponding end deployment stops on the upper part of said columns. It is equipped with fabric tarpaulins for the walls and zipper closure on its front wall; and on the upper part of said columns there are arranged four cone-shaped stops for its support and balance during stacking of said cabins in the folded state. When folded, they allow storing up to 200 cabins in a space of 5.9 x 6.15 x 5.9 metres. The cabin is equipped with fittings for use in the modes of chemical recirculating toilets; squat toilets; dry toilets with mechanical waste discharge; and vacuum toilets.