Combined harvester used in wheat test site

The invention relates to a combined harvester used in a wheat test site. The combined harvester comprises a header (5), a threshing bin (6), a conveying belt (10), a discharging cylinder (12) and a packaging bag (15) and is characterized in that an auger A (3) and an impeller (1) are arranged in the header (5), a threshing device (7) is arranged at the upper end in the threshing bin (6), an augerB (8) is arranged at the lower end in the threshing bin (6), a vibratory screen (14) is arranged in the discharging cylinder (12), the top of the discharging cylinder (12) is connected with a dust removal fan (13), and the bottom of the discharging cylinder (12) is connected with the packaging bag (15). The combined harvester is strict and reasonable in structure, and one set of impeller teeth isof a baffle structure, so that wheat completely enters the header without residues, harvesting is thorough, and the testing accuracy is ensured. Auger teeth A on the header are provided with a rubberring A, so that pushing is