The utility model discloses a portable bathtub, including shell, inner bag, the shell is not confined cube bodily form casing of top, the inner bag is arranged in in the shell, the topside of inner bag with the topside hook formula of shell is connected, the inner bag is used for holding the shower water, the utility model provides a portable bathtub through setting up the shell into folding form, makes the bathtub easily accomodate, and occupation space is few, and the inner bag uses soft heat preservation waterproof material to make, and manufacturing process is simple, and low in manufacturing cost is honest and clean, good, clean, the removal transportation of being convenient for of being convenient for of thermal insulation performance.