Device and method for removing micro-plastic pollutants in sludge through biological enhancement method

The invention discloses a device and a method for removing micro-plastic pollutants in sludge by a biological enhancement method. The device comprises a supporting structure, a graded filtering mechanism and a biological treatment mechanism, wherein the graded filtering mechanism and the biological treatment mechanism are arranged in the supporting structure; the supporting structure comprises a supporting shell with an upward opening, and a plurality of horizontally-placed grading supporting plates are fixedly connected into the supporting shell. A plurality of vertically-through grading containing holes are formed in the grading supporting plate, the grading filtering mechanism comprises a plurality of filtering containing shells which are fixedly connected into the grading containing holes in a one-to-one mode, the filtering containing shells are hollow shells, the upper side and the lower side of each filtering containing shell are each provided with a plurality of through holes which are internally and e