A sanitary bath tub comprises a tub body and a sanitary lining adsorbed in the tub body. The tub body comprises an inner wall and an outer wall, wherein an air exhaust cavity is formed between the inner wall and the outer wall, and air exhaust micro pores are formed in the inner wall and used for adsorbing the sanitary lining. Each upper edge opening of the tub body is provided with a groove, and an elastic sealing ring is arranged in the groove. A press ring used for fixing the sanitary lining is arranged above each elastic sealing ring. The bottom of each press ring is provided with a plurality of pull rods which extend into the air exhaust cavity. An inhaul cable is fixed at the lower end of each pull rod, and an elastic return mechanism is arranged on the pull rod. The bottom of the tub body is provided with an operating cavity, and the top of the operating cavity is provided with an inhaul cable collecting disc. An inhaul cable sealing mechanism is arranged at the inhaul cable collecting disc. All the inhaul cables penetrate through the inhaul cable collecting disc and the inhaul cable sealing mechanism and are collected in bundles. According to the sanitary bath tub, an air pump is utilized for pumping out air between the sanitary lining and the inner wall of the tub body, the sanitary lining is enabled to be adsorbed to the inner wall of the tub body, then the sanitary lining is tightly pressed in the groove through the press ring, and therefore not only is convenient and sanitary use by a bather guaranteed, but also waste of resources is prevented.