This machine adopts a seamless circular conveyor belt, which solves the problem that traditional conveyor belts are prone to tearing from the root of the joint, and also eliminates the unnecessary trouble caused by the joint scratching and damaging the packaging for customers. It has an automatic lifting function and can perform operations at different heights. Additionally, it is equipped with a counter. The dust removal, grain throwing and threshing device (detachable) features excellent self-locking performance, strong safety performance, wide working surface and large conveying capacity.