Provided is a Tuo Ba boat. The Tuo Ba boat comprises a boat body and a boat bottom plate, wherein a drain valve part disposed on an inner side of the boat bottom plate is matched with a drain through hole on the boat bottom plate. The drain valve part comprises a triangle base which is connected with the boat bottom plate through rivets in a riveting mode, and the triangle base is provided with a valve hole which is communicated to the drain through hole. The triangle base is provided with a plunger part, the plunger part is matched with the valve hole, an end socket is disposed on the top of the plunger part, and the plunger part is disposed on the triangle base through a flexible connecting portion between the end socket and the triangle base. A nose-shaped button cover is disposed on an outer side of the boat bottom plate corresponding to the drain valve part, the nose-shaped button cover covers the drain through hole, and a nose tip portion of the nose-shaped button cover is arranged in the position that is deviated from an advancing direction of the Tuo Ba boat. The plunger part is used to plug the drain through hole at ordinary times, the plunger part can be unplugged when the Tuo Ba boat is launched and moves fast, and therefore a cavity of the Tuo Ba boat are communicated with the nose-shaped button cover. Fast movement of the Tuo Ba boat enables negative pressure to be formed inside the nose-shaped button cover. Once water exists in the cavity of the Tuo Ba boat, the water can be discharged off smoothly through the drain through hole and the nose-shaped button cover.