Lock for bathtub door

The utility model relates to a lock for a bathtub door. The lock for the bathtub door comprises semicircular rotating discs arranged at the upper part and the lower part of the inner side of a bathtub respectively, and two spacers corresponding to each other on the bathtub door, wherein the surfaces of the rotating discs which are tightly adhered to the wall of the bathtub are threaded surfaces; the two rotating discs are connected with each other through a rotating disc connecting rod; the rotating disc connecting rod is fixed at a rotating eccentric position at the same side of the two rotating discs; a handle is arranged on the rotating disc at the upper part; the spacer at the upper part and the rotating disc at the upper part are positioned on a same horizontal line; and the spacer at the lower part and the rotating disc at the lower part are positioned on a same horizontal line. The lock for the bathtub door has the beneficial effects of simplicity in structure, low manufacturing cost, uniform sealing p