The invention discloses a ceiling dust collector. The dust collector comprises a dust collector body, a dust collection box and a balance component, wherein a motor, a plurality of fans connected in series, and a dust collection channel are arranged in the dust collector body; the dust collection box is communicated with the dust collection channel; the motor transmits power to the fans via a power input shaft, and the fans are connected with a power output shaft; and the balance component is arranged on the outer sides of the fans. The balance component comprises a large rotation ring, a small rotation ring, a first rotation shaft, a second rotation shaft, a base plate, a support rod and a support plate; the fans and the small rotation ring are connected with the support rod via the support plate; the small rotation ring and the large rotation ring are connected via the first rotation shaft; the small rotation ring and the large rotation ring rotate relatively around the first rotation shaft; the large rotation ring and the base plate are connected via the second rotation shaft; and the large rotation ring and the base plate rotate relatively around the second rotation shaft. According to the ceiling dust collector, relative balance of the dust collector body when in suspension is kept via the fans and the balance component, and the difficulty of cleaning the ceilings in homes, shopping malls and work places is solved.