Novel foldable bathtub

The invention relates to a bathtub, in particular to a novel foldable bathtub. The novel foldable bathtub comprises a foldable outer frame, and toilet space can be saved when the bathtub is not used. A liner is arranged in the foldable outer frame, so that a user can feel more comfortable when taking a bath. Limiting holes are formed in the liner to prevent too much water in the liner from splashing onto the ground. A movable plate can be adjusted through an adjustment device, so as to adjust the backing angle of a user, and the user can adjust the angle of the movable plate according to personal preference in use. An outer-layer liner body on the liner adheres to the lower end of a top plate on a fixed device, and a gap is reserved between a side plate IV and the outer-layer liner body. A foldable outer frame side plate I and a side plate II are in interference fit with the gap between the side plate IV and the outer-layer liner body. A cylinder I on the liner is in clearance fit with a drainage port I. A ho