Sewage treatment device of garbage treatment system

The utility model belongs to the technical field of sewage treatment, and particularly relates to a sewage treatment device of a garbage treatment system, which comprises a water accumulation tank, a filter box is transversely mounted in the water accumulation tank and penetrates through the right side wall of the water accumulation tank, and a connecting groove corresponding to the filter box is arranged on the inner wall of the left side of the water accumulation tank. A fixed frame is installed at the bottom of the filter box, a filter screen is arranged in the fixed frame, a pull plate is arranged on the right side face of the filter box, a screw rod is arranged on the right side wall of the water accumulation box, and a through hole corresponding to the screw rod is formed in the plate wall of the pull plate; filter screens with different hole diameters can be sequentially arranged through the matching of the filter box and the connecting groove, so that sundries can be collected under the matching of th