An embodiment of the utility model provides a biological filter for handling domestic sewage, including the filter bed structure, set gradually under to from last in the filter bed structure: water distribution region, good oxygen district, hold concurrently oxygen district, anaerobism district and catchments area, water distribution region is provided with along horizontal direction distributed arrangement's branch air distribution pipe, and branch air distribution pipe includes: an at least water distribution supervisor, water distribution supervisor have arranged many water distribution branch pipes along water distribution supervisor's length direction, and the water distribution branch pipe is linked together with water distribution supervisor, are provided with at least one atomizinginjection structure on the water distribution branch pipe, and atomize injection structure and be linked together with the water distribution branch pipe. The utility model discloses an embodiment can guarantee that domestic sewage realizes the polluting substances minimum discharge when ultralow running cost uses.