Threshing and separating device for corn

The utility model discloses a threshing and separating device for corn. The threshing and separating device comprises a threshing roller with threshing teeth, and the threshing teeth comprise tooth rods with ball-head-shaped top ends. A threshing concave plate is arranged below the threshing roller and comprises a concave plate body, the concave plate body comprises two side plates, supporting plates are arranged between the two side plates, a longitudinal partitioning plate is arranged between the two supporting plates and provided with partitioning strips, and the partitioning strips and the longitudinal partitioning plate are flush with the side plates. A separating roller is located on one side in the flowing direction of the corn and provided with separating teeth and separating plates in a staggered mode, and a separating concave plate communicated with the threshing concave plate is arranged below the separating roller. Threshing is achieved through rubbing between the threshing teeth and the threshing concave plate, power consumption is low, and the cost is low. Through the threshing concave plate, while passing performance and sieving efficiency are guaranteed, strength and using reliability are improved, and the breakage rate is decreased; meanwhile, through replacement with the threshing and separating device for the corn, the effect of harvesting the corn is achieved, and the using rate of a grain harvester is increased.