Variable-gap threshing cylinder with telescopic spike teeth and combine harvester

The utility model discloses a spike tooth telescopic type variable gap threshing cylinder and a combine harvester, the spike tooth telescopic type variable gap threshing cylinder comprises a feeding wheel, a main shaft, a spike tooth telescopic type threshing toothed bar and a supporting spoke disc, the feeding wheel and the supporting spoke disc are sequentially installed on the main shaft in the feeding direction, and the spike tooth telescopic type variable gap threshing cylinder is arranged on the main shaft. The spike-tooth telescopic threshing toothed bar is fixed on the supporting spoke disc; the threshing toothed bar with the telescopic spike teeth comprises a toothed bar body, the spike teeth and springs, the toothed bar body, the spike teeth and the springs are fixed to the supporting amplitude disc, mounting holes are formed in the positions, where the spike teeth are assembled, of the toothed bar body, the spike teeth are assembled in the mounting holes of the toothed bar body in a telescopic mode