Multi-stage barrel type coaxial composite filtering system for coating production

The invention discloses a multi-stage barrel type coaxial composite filtering system for coating production. The multi-stage barrel type coaxial composite filtering system comprises an outer barrel body which is fixedly mounted on a seat frame in a horizontal posture, a central shaft rod is coaxially and rotatably connected into the outer barrel body, and a plurality of filtering barrels are coaxially and fixedly connected into the outer barrel body; the filtering barrels are rotatably and hermetically connected with the central shaft rod; the plurality of filtering barrels are spaced from each other from inside to outside and are arranged in a manner that the diameters are gradually increased, and the filtering pore diameters of the filtering barrels are gradually reduced from inside to outside; the inner space of the innermost layer of filtering barrel forms a cylindrical filtering cavity, annular filtering cavities are formed between the adjacent filtering barrels, each annular filtering cavity is provided