The utility model discloses a grape fruit size grading device which comprises a conveying belt, a grading
assembly used for conducting size grading on grape fruits is arranged at the
tail end of the conveying belt, the grading
assembly is arranged at the
tail end of the conveying belt in a downward inclined mode, and the grading
assembly comprises a blocking edge, a feeding plate, a discharging plate and a grading rod. The blocking edges are fixed to the two side edges of the conveying belt, a feeding plate and a discharging plate are fixed to the inner sides of the blocking edges, and a grading rod is fixed between the feeding plate and the discharging plate. According to the grape fruit grain size grading device, the feeding plate, the discharging plate and the grading rods which are obliquely arranged are arranged at the
tail of the conveying belt, grape fruit grains conveyed on the conveying belt can freely slide downwards from the feeding plate, the discharging plate and the grading rods, and the grape fruit grains are arranged through the openings which are sequentially increased between the grading rods; grape fruit grains with different sizes can fall at different positions on the grading rod, so that the automatic grading work of the grape fruit grains can be realized.