Prawn grader

The utility model discloses a prawn grader and belongs to the technical field of screening equipment. Two screening mechanisms are arranged, two screening sets are erected on a turnover frame, and a first driving motor is used for driving a first transmission belt to rotate and driving a plurality of first driven belt wheels to rotate, so that rotation of screening rollers is achieved, prawn sorting is achieved, manual grading is reduced, and the grading precision is improved; the distance between the two screening rollers is adjusted to be large in the front and small in the rear, in the prawn screening process, prawns are in a vertical state under stirring of the prawn stirring groove, small prawns fall off from the position between the rear sides of the two screening rollers, large prawns fall off from the position between the front sides of the two screening rollers, and the prawns are automatically screened and classified according to the sizes; and by arranging the conveying mechanism, a second driving