A dust collection assembly , comprising: a first annular ring having a first outer ring , wherein the first annular ring has a first electrically connecting piece configured to be connected with one of a positive pole and a negative pole of a power source ; a second annular ring having a second outer ring and a plurality of second blades disposed in an inner surface of the second outer ring along a circumferential direction, wherein the second annular ring has a second electrically connecting piece configured to be connected with the other one of the positive pole and the negative pole of the power source ; and an insulation spacing assembly disposed between the first annular ring and the second annular ring and spacing the first annular ring and the second annular ring apart; characterized in that , the first annular ring has a plurality of first blades disposed in an inner surface of the first outer ring along a circumferential direction, the second annular ring is disposed below the first annular ring , the plurality of second blades and the plurality of first blades are arranged to be staggered in the circumferential direction so that a plurality of high voltage direct current fields can be formed between the first annular ring and the second annular ring ; and the dust collection assembly further comprises an air guide configured to have an annular shape and fitted over the first annular ring and/or the second annular ring , wherein the air guide is connected with the first annular ring and/or the second annular ring by means of a snap, and an external diameter of an upper end of the air guide is larger than an external diameter of an lower end of the air guide . a first annular ring having a first outer ring , wherein the first annular ring has a first electrically connecting piece configured to be connected with one of a positive pole and a negative pole of a power source ; a second annular ring having a second outer ring and a plurality of second blades disposed in an inner surface of the second outer ring along a circumferential direction, wherein the second annular ring has a second electrically connecting piece configured to be connected with the other one of the positive pole and the negative pole of the power source ; and an insulation spacing assembly disposed between the first annular ring and the second annular ring and spacing the first annular ring and the second annular ring apart; characterized in that , the first annular ring has a plurality of first blades disposed in an inner surface of the first outer ring along a circumferential direction, the second annular ring is disposed below the first annular ring , the plurality of second blades and the plurality of first blades are arranged to be staggered in the circumferential direction so that a plurality of high voltage direct current fields can be formed between the first annular ring and the second annular ring ; and the dust collection assembly further comprises an air guide configured to have an annular shape and fitted over the first annular ring and/or the second annular ring , wherein the air guide is connected with the first annular ring and/or the second annular ring by means of a snap, and an external diameter of an upper end of the air guide is larger than an external diameter of an lower end of the air guide . <EOS>