The present invention mainly relates to a potato digger, especially the structure of a separation wheel type potato soil separator. The separation wheel type potato soil separator comprises a main shaft, fixed bases, support circular rings, separation fillips and elastic rubber sleeves. The separation wheel type potato soil separator is characterized in that the main shaft is a stepped shaft, which is provided with holes spaced apart by 50-60mm, and a keyway is arranged at the right end of the separator; the fixed base is provided with an installing holes in the middle and a fixing hole along the radial direction; the support circular rings are welded together with the fixed bases through round steels, and the fixed bases are installed and uniformly distributed on the main shaft by using bolts; a plurality of the separation fillips with the same shape and size are arranged at the peripheries of the support circular rings; the separation fillips are bent at the middle, and the tops of the separation fillips are hemispheric in shape; the elastic rubber sleeves are hollow. The separation wheel type potato soil separator provided by the invention is small in volume, light in weight, and enables high potato exposure rate, low potato damage rate, and less energy consumption and smooth machine operation.