The invention relates to the technical field of
agricultural machinery and particularly discloses a plot seed
threshing machine. The
machine mainly comprises a vertical type fruit ear
threshing system, a fan, a motor, a vibrating screen, a sorting fan and the like, wherein fruit ears, such as soybeans and the like, enter into a
threshing chamber through a feeding port; a vertical type cylindrical concave plate and a spindle with spiral nail teeth are arranged in the threshing chamber; a
spiral blade is arranged under the spindle; a high-speed rotating
impurity-sucking fan is arranged above the spindle; when the spindle rotates at an intermediate speed, grains are separated by the cylindrical concave plate under the action of
centrifugal force and under the
rubbing action of the nail teeth and the cylindrical concave plate; stalks and big broken straws enter into a sorting
system; chaffs and a majority of straws are discharged from a
straw outlet, under the action of the
spiral blade and speedily rotating fan; the grains and big broken fruit ears fall into a vibrating sorting screen; the broken fruit ears in the grains are filtered through grids; and the seeds fall into a seed receiving bucket while the broken fruit ears and straws are discharged from the
straw outlet. By using the plot seed
threshing machine, the residual quantity in the
machine is almost zero and the time for cleaning the machine is shorter.