A foldable boat includes a boat hull, left and right wing members, two forward buoyant bodies, and two rearward buoyant bodies. When the foldable boat is in a folded position, flat bodies of the left and right wing members are substantially perpendicular to a bottom wall of the boat hull, and the forward and rearward buoyant bodies can be packed in an accommodation space of the boat hull. When the foldable boat is in an unfolded position, the flat bodies are substantially parallel to the bottom wall, and each of the forward buoyant bodies and a corresponding one the rearward buoyant bodies are fastened to a corresponding one of the left and right wing members so as to provide a buoyant force to the boat hull.