Conveying device with self-threshing mechanism and grain combine harvester

The invention relates to the technical field of grain threshing treatment, in particular to a conveying device with a self-threshing mechanism, the conveying device is composed of a first conveying mechanism, a second conveying mechanism and a third conveying mechanism, the self-threshing mechanism is used for conducting threshing treatment on materials to be treated, and the third conveying mechanism is used for conducting threshing treatment on the materials to be treated. And the threshed materials fall into the third conveying mechanism through the self-threshing mechanism, the third conveying mechanism is used for conveying the treated materials to a screen surface, and the first conveying mechanism, the second conveying mechanism, the third conveying mechanism and the self-threshing mechanism communicate with one another. When impurities are conveyed on the combine harvester, spike heads which are not threshed completely can be threshed through the self-threshing mechanism in the modes of rubbing, beati