Device capable of cleaning dirt and collecting fish and operation method

The device comprises a trash rack, one end of the trash rack is installed on a connecting rod, the bottom end of the connecting rod is in sliding fit with a trash rack track, the trash rack track is arranged on the upstream of a river reach and fixed to a river bank, the other end of the trash rack is wound on a storage rod, and the storage rod is connected with the trash rack track. The storage rod is arranged on the trash rack rear side sliding rail in a sliding mode, and the trash rack rear side sliding rail is fixed to the lower end of the trash cleaning box; the connecting rod is connected with a bubble fish guide grid, and the other end of the bubble fish guide grid is connected to the fish collecting box. According to the device, non-interfering operation of trash cleaning and fish collection in the same space of a river channel can be met, the trash rack with the fixed shaft in mechanical rotation achieves a good trash holding effect, meanwhile, the problem of pollutant blockage is effectively solved,