The invention discloses a water-suction two-stage dust-air separation cyclone dust cup and a dust collector with the same. The dust cup comprises a dust cup cover and a dust cup body, and the dust cupbody comprises a cup body portion. The dust cup is characterized in that the dust cup body further comprises a primary cyclone and a secondary cyclone, the primary cyclone is arranged in an opening of the dust cup body, the secondary cyclone comprises a secondary cyclone body with an air guide hole in the middle, and the bottom end face of the secondary cyclone body is provided with at least oneair guide portion. Each air guide portion comprises a spiral air guide plate, a spiral air guide passage and an air guide passage retaining plate, wherein the spiral air guide plate surrounds the airguide hole to form the spiral air guide passage, a first end of the spiral air guide plate is closed by the air guide passage retaining plate, and the spiral air guide passage extends longitudinally and spirally along the center line of the air guide hole. The dust collector further comprises a brush cyclically adopting motor return air as brushing power. Two-stage dust-air separation is realized,amount of parts and assembly procedures are sharply reduced, dust capacity of the dust cup is increased, and stable comprehensive performances are guaranteed.