The present invention relates to a pet bathtub which has a waterproof sheet bathtub unit connected through a foldable frame to be folded and unfolded. More specifically, the pet bathtub can be stored easily while support frames on both sides and the sheet bathtub are in a folded form and be used as a bathtub in an unfolded form, thereby enhancing user convenience. The pet bathtub includes: first and second support frames (10A, 10B) connecting vertically erected legs (11) using horizontal frames (12); a foldable frame (20) which is mounted between the first and second frames (10A, 10B) while having X-shaped links (21) continuously coupled to be folded and unfolded; and the sheet bathtub unit (30) made of a waterproof sheet while being in the shape of a water storage container. The upper periphery of the sheet bathtub unit (30) can be fixed with Velcro-tapes (31) while surrounding the horizontal frames (12) of the first and second support frames (10A, 10B).
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