The invention relates to a double-toothed-disc single-arc-toothed-plate nut hulling mechanism. The mechanism comprises a feeding hopper, the feeding hopper is connected with the front end of a gradingscreening roller, through grooves are formed in the side walls of all-grade rollers of the grading screening roller and distributed from the front end to the back end of the grading screening roller,and the sizes of the through grooves of all-grade rollers of the grading screening roller are increased in sequence; sliding groove boxes are arranged at the lower sides of all-grade rollers of the grading screening roller, openings are formed in the bottoms of the sliding groove boxes, extrusion hulling mechanisms are arranged at the lower sides of the sliding groove boxes, and nut collection boxes are arranged at the lower sides of the extrusion hulling mechanisms; the extrusion hulling mechanisms and the grading screening roller are connected with a power device. According to the double-toothed-disc single-arc-toothed-plate nut hulling mechanism, by adopting the feeding hopper, a grading screening mechanism and the extrusion hulling mechanisms which are connected in sequence, nuts fallinto the sliding groove boxes through size classification, fall into the extrusion hulling mechanisms under the gravity effect and are extruded and gradually broken up, finally the broken nuts fall into the nut collection boxes, batch and continuous nut hulling is achieved, and the efficiency is high.