Circulating water fish-farming fish manure sewage concentration device and manure sewage concentration and recycling system

The utility model discloses a circulating water fish-farming excrement sewage concentration device and a circulating water fish-farming excrement sewage concentration and recycling system. Wherein a rotary drum is rotationally connected to the rack; water filtering holes are distributed in the rotary drum; the rotary drum is driven by a motor to rotate around a central shaft; end closure of a drum, other end opening, the open end is a water inlet end; an air blowing device and a spraying pipe are arranged above the rotary drum; the air blowing device is connected with an air compressor or a high-pressure air tank; the air blowing device blows air into the rotary drum, a plurality of water spraying openings or water spraying heads spraying water into the rotary drum are arranged on the lower side of the spraying pipe, a central shaft of the rotary drum is a hollow shaft, an excrement receiving hopper is arranged on the central shaft, the bottom end of the excrement receiving hopper is communicated with the cen