The invention relates to a dust cup device for a dust collector, which comprises a cup body provided with a tangential total air inlet, and a separator arranged in the cup body. The dust cup device is characterized in that the separator comprises a cylindrical micropore filter which is arranged between the cup bottom and a cup cover through an end sleeve at the upper end and an end sleeve at the lower end, the transition part between the micropore filter and the end sleeve at the lower end is extended with a dust blocking cover tilting outwards, and a deposition cavity for large granule dust is formed between the dust blocking cover and the cup body. The dust cup device is further provided with a cyclone with a tangential air inlet, the lower part of the cyclone is provided with a dust blocking sheet, and the lower end of the cyclone is directly or indirectly fixed in the end sleeve at the lower end to form a deposition cavity for small granule dust; and the center of the cup cover isprovided with a total air outlet and an air outlet pipe, and the air outlet pipe is matched with the air inlet on the cyclone. The dust cup device adopts various separation structures and multi-stageseparation, has good separation effect, is easy to separate the large and small granule dust, is not easy for entrainment, has few components, and is easy to assemble and use.