The invention discloses a wheat combine harvester. The harvester consists of a rack, a header, a gap bridge, a threshing device and a grading device. The header is connected to a threshing chamber through the gap bridge. The threshing chamber is fixed on the rack. The gap bridge is hinge jointed to the rack through a bearing block of a driving shaft. The threshing device consists of a threshing chamber, and a threshing cylinder installed in the threshing chamber. The threshing chamber consists of an upper cover, a concave grate and a straw outlet. A plurality of spiral plates are fixed on the inner wall of the upper cover. A plurality of spiral guide grooves are installed between the spiral plates. The straw outlet is installed at one side of the threshing chamber. The grading device consists of a grading sieve. The header is a header for harvesting corn. The gap bridge is a gap bridge for harvesting corn. The concave grate for harvesting corn is an obround hole concave grate. The grading sieve for harvesting corn is a round hole grading sieve. A striker plate is installed in each of the three spiral guide grooves from the right end of the upper cover to the left end. The striker plates are angle iron. The wheat combine harvester can efficiently increase the usage frequency of wheat combine harvesters, and reduce the production cost of users.