Screen drum grating rotary filtration device

The invention discloses a screen drum grating rotary filtration device, and belongs to the technical field of filtration equipment. A water tank is fixedly arranged on the outer side of the rotary filter cylinder, the rotary filter cylinder is communicated with the bottom of the water tank, and a water outlet is fixedly formed in the outer side of the rotary filter cylinder. The screen drum is rotationally arranged in the rotary filter drum; the cleaning brush is attached to the inner wall of the screen drum; according to the device, sewage is discharged into the screen drum to be filtered outwards, so that fine impurities are cleaned through the cleaning brush on the inner wall in the rotary filtering process of the screen drum, and the cleaned impurities are separated from the inner wall of the screen drum under the movement action of the sewage; therefore, the problem that water sources are wasted seriously when water is used for washing the screen drum is effectively solved, water sources do not need to b