The invention discloses a gordon euryale seed grading machine. Through a rotary screen composed of a primary grading roller I and a primary grading roller II, primary screening of gordon euryale seeds is conducted, the gordon euryale seeds are screened into two large specifications, and small seeds are screened out. Fine and accurate grading is conducted on the primarily screened gordon euryale seeds through a final grading roller I and a final grading roller II, and the gordon euryale seeds can be screened into six or more specifications. Meanwhile, the small seeds can be screened by the primary grading roller II into 2-3 specification grades. Because a scraper blade structure is additionally arranged, the mesh blockage problem can be solved.