The invention provides a reverse tongue-shaped flip bucket. The reverse tongue-shaped flip bucket mainly designed in that on the basis of a conventional flip bucket, bottom plates (and side walls) ontwo sides extend downstream along a water flow direction, and the middle part is sunken inwards, so that the reverse tongue-shaped flip bucket is formed. According to the structure, the bottom platesat the two sides of the outlet at the tail end of the flip bucket extend gradually along the water flow direction to form an opening edge with a plane shape of a C-shaped curve. The reverse tongue-shaped flip bucket can prevent a deflecting flow water tongue from diffusing towards the bank edges of the two sides and scouring the bank slopes of the two sides, thereby ensuring the safety and stability of the bank slopes.