The de-stoner is used for grading and de-stoning garlic, wheat, soybeans, corn, etc. Due to the role of wind selection, it can effectively remove the material “side by side stone” or large specific gravity impurities, assist in cleaning the material light debris, and can also effectively remove the light debris (buckwheat, grass seeds, dust) in the grain particles, and can also be used for seed selection of various grains.