Fishway monitoring device

The invention relates to the technical field of fishway engineering, in particular to a fishway monitoring device. The fishway monitoring device comprises a net cage, a water collecting tank and a lifting mechanism, a plurality of net plates are arranged in the net cage in parallel at intervals and divide the net cage into a plurality of containing areas in the length direction, through holes are formed in the end face of one end, in the length direction, of the net cage, and through holes are formed in the plate face of each net plate; the opening sizes of the through holes are sequentially reduced in the extending direction from one end of the opening of the net cage to the other opposite end, the bottom face of the net cage is connected with the inner bottom wall of the water collecting tank in an attached mode, and the portion, close to the bottom face, of the side face of the net cage is connected with the inner side wall of the water collecting tank in an attached mode. The lifting end of the lifting me