Abstract: In order to meet demand of soybean research work，according to artificial threshing principle，a special soybean threshing machine using for single soybean sheller in the room was designed through simulation modeling.Overall structure and working principle of the machine were introduced.Some key parts of soybean threshing machine were analyzed.Results showed that the thresher had some advantages，such as reasonable design，simple operation，high threshing rate，low harmful to seeds，high work efficiency，and no dust.It could meet demands of scientific research，laboratory test and seed production for a long period of time.