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.