The invention discloses a self-adaptation grading unshelling integrated device for nuts. The self-adaptation grading unshelling integrated device comprises an upper differential speed belt, a lower differential speed belt, a front adjustment hinge, gap adjustment side plates, a rear adjustment hinge, a grading roller, an unshelling roller, an air blower and an air duct. The grading roller is located above the unshelling roller and is parallel with the unshelling roller, a certain inclination angle is formed, the gap adjustment side plates are located on the side face of the grading roller and the side face of the unshelling roller, the lower differential speed belt and the upper differential speed belt are arranged in parallel, a certain distance is formed between the two belts, and the air blower and the air duct are located below the lower differential speed belt. The functions of nut grading and unshelling and shell and nutlet separating under the action of rubbing are first integrated on the same device; during grading and unshelling, the self-adaptation grading unshelling integrated device can select suitable positions for the nuts according to the sizes of the nuts for grading and unshelling, and therefore the damage rate of nutlets during unshelling is greatly decreased. The self-adaptation grading unshelling integrated device has the advantages of being convenient to use, small in size and low in energy consumption and damage rate of the nutlets.