Underwater pollutant crushing device

The utility model belongs to the technical field of garbage treatment, particularly relates to an underwater pollutant crushing device, and aims to solve the problems that when underwater pollutants are fished out and crushed at present, water cannot be discharged due to the fact that crushing machinery adopted at present adopts a cutting and crushing mode, and dehydration treatment is needed during later treatment. According to the technical scheme, the device comprises a support, an arc-shaped box body is fixedly installed at the top of the support, a supporting assembly is installed on the rear side of the arc-shaped box body, a driving motor is installed on the supporting assembly, and a moving hole is formed in the inner wall of the rear side of the arc-shaped box body. The driving motor can be started to drive the crushing roller to rotate, at the moment, the pollutants can be extruded and crushed, so that water contained in the pollutants can be extruded out, the pollutants can be in a relatively dry s