The invention provides a high-throughput suspending cleaning and loss reducing separating device of a potato harvester. The high-throughput suspending cleaning and loss reducing separating device is characterized in that the two ends of two driving rolls I and the two ends of two driven rolls I are supported on two stand plates of a rack, the driving rolls I and the driven rolls I are alternatelyarranged, two separation screens sleeve the adjacent driving rolls I and driven rolls I respectively, the two ends of a cam shaft containing a plurality of cams are supported on the two side stand plates, located below a separating device, of the rack, one end of a vibration plate is hinged to the stand plates on the two sides of the rack, and the other end of the vibration plate is supported on the cams. A fan is mounted below the outer side of one stand plate, an opening of the air outlet is horizontally formed in below a vibration device upwards, and is correspondingly located below the middle of a clearance of the two separation screens of the separating device, the two ends of a driving roll II and the two ends of a driven roll II are supported on two side plates with the plate facesperpendicular to the stand plates of the rack respectively, and a conveying belt is hung on the driving roll II and the driven roll II. According to the high-throughput suspending cleaning and loss reducing separating device, the density difference of a mixture can be reasonably utilized, in the separation process, mutual contact is avoided, separation is thorough, and the cleaning and loss reducing control effect is good.