The AC speed regulating motor drives the grid cylinder through the reducer, and the sewage enters the water tank through the inlet valve. It rises to the filtered water level line through the buffer and uniform distribution box partition. The purified water enters the water storage box through the grid gap and is discharged outward at the bottom. At the same time, the grid is cleaned, and impurities and fiber organic matter larger than the grid gap are discharged to the slag hopper for treatment. The moisture content of the garbage discharged by the grid is 30% -50% lower than that of the original internal inlet microfiltration machine.