NOVELTY - Overflow rain sewage in-situ elimination stepped ecological pollution-control structure comprises uniform water-distribution bearing layer, biological blocking adsorbing packing, biological filtering packing, plant substrate layer and triangular notch weir. The structure is composed of two levels, where the bottom of first level has uniform water-distribution bearing layer, and the upper part of water-distribution bearing layer is filled with biological blocking adsorbing packing. The plant substrate layer is a structure surface formed by polyethylene screen, solid and plants.    USE - Overflow rain sewage in-situ elimination stepped ecological pollution-control structure.    ADVANTAGE - The structure solves the problems of large volume, large medicine consumption, and high energy cost in traditional overflow rain sewage in-situ elimination equipment. It has simple design, low construction cost, no power operation, convenient maintenance and operation, long service life, and good sewage dealing effect.    DETAILED DESCRIPTION - Overflow rain sewage in-situ elimination stepped ecological pollution-control structure comprises uniform water-distribution bearing layer, biological blocking adsorbing packing, biological filtering packing, plant substrate layer and triangular notch weir. The structure is composed of two levels, where the bottom of the first level is provided with uniform water-distribution bearing layer, and the upper part of the water-distribution bearing layer is filled with biological blocking adsorbing packing. The plant substrate layer is covered on the top part of first level structure. The second level is filled with gravels and bamboo carbon chips in series according to the gradually increasing diameter. The triangular notch weir is arranged between the water outlet of each level structure. The water permeating area is 30-40% as the connection area of each level. The structural water-distribution bearing layer is formed by galleries and reinforced concrete strip plates. The biological blocking adsorbing packing is middle-hollow bamboo carbon cylinder. The plant substrate layer is a structure surface formed by polyethylene screen, solid and plants.    DESCRIPTION OF DRAWING(S) - The drawing is a schematic flow diagram of an overflow rain sewage in-situ elimination stepped ecological pollution-control structure (Drawing includes non-English language text).