Abstract: A folding pet bathtub is disclosed, including a foldable support frame and a flexible bathtub provided on the foldable support frame. The foldable support frame includes a support component, a first bracket component and a second bracket component that are foldable and disposed sequentially from top to bottom on an inside of the support component, two sets of linkage components for connecting the first bracket component and the second bracket component, and a locking device disposed on the linkage components for preventing the first bracket component and the second bracket component to be folded. By setting linkage components to drive the first bracket component and the second bracket component to unfold or fold, the folding pet bathtub is not only convenient for daily unfolding use, but also is folded when not in use, which can reduce volume of the bathtub, the structure is simple and convenient to use.