Sewage treatment device for building water supply and drainage

The utility model relates to the technical field of building sewage treatment, in particular to a sewage treatment device for building water supply and drainage, which comprises a reaction box, a filter box fixedly mounted at the lower end of the reaction box, a stirrer rotatably connected to the middle in the reaction box, and a dosing port communicated with the inside of the reaction box arranged at the upper end of the reaction box. A water injection pipe communicated with the interior of the reaction box is arranged on the upper portion of the left end of the reaction box, a water outlet pipe communicated with the interior of the filter box is fixedly installed at the right end of the filter box, a protective shell is fixedly installed at the left end of the filter box, a cleaning mechanism is arranged in the protective shell, and two filter bodies are fixedly installed in the filter box. And two cleaning doors are movably mounted at the right end of the filter box through hinges. According to the sewage