The invention discloses a clay soil peanut harvesting separator. The harvesting separator comprises a separator body, and an elevating device which is arranged on the separator body and ascends in an inclined mode. The harvesting separator is characterized in that a peanut separator is arranged under the elevating device, the peanut separator and a rack mutually clamp peanut seedlings, the peanut separator comprises a driving separating wheel and a driven separating wheel, the driving separating wheel and the driven separating wheel are each provided with 3-6 rows of grooves a and grooves b corresponding mutually, the two sides of each groove a each comprise one retaining edge, the two sides of each groove b each comprise one retaining edge, a rod a and a rod b connected with the retaining edges at the two sides of the corresponding groove a are arranged in each groove a, the rods a and the rods b comprise separating rods with the number larger than 6, the two sides of the corresponding center position of the driving separating wheel and the driven separating wheel are each provided with one pressing plate, and the pressing plates correspond and extrude the separating rods. The harvesting separator is simple in structure, and capable of effectively separating peanuts in clay soil, so that the harvesting efficiency of the peanuts in the clay soil is further improved.