Fish collecting well suitable for tail water of power station

The invention discloses a fish collecting well suitable for tail water of a power station. The fish collecting well is arranged on the downstream side of a tail water tunnel guide wall of the power station. A fish collecting pit and a fish collecting box arranged in the fish collecting pit are arranged in the fish collecting well, flow guide walls extending to the two sides of the tail water tunnel guide wall are arranged on the two sides of the fish collecting well, tail water channels which are communicated with the fish collecting box and can be opened and closed are formed between the flow guide walls and the tail water tunnel guide wall, and a plurality of energy dissipation piles are arranged between the fish collecting box and the tail water channels on the two sides; a plurality of fish inlets which are communicated with the fish collecting box and can be opened and closed are formed in the downstream side of the fish collecting well. The tail water of the power station is drained into the fish collec