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This article is about researching the reasonable shape of the hammer feed mills separation device. We got the shape under the situation that the friction did the minimum work by calculating the frictions work when the corn granules moving inside the separation devices tube. The new separation device was made out on the basis of analysis and calculation. On the one hand, we used Fluent simulation to analyze the movement of the materials in the new separation device and the original separation device; on the other hand, we contrasted the actual transport results of the two kinds of separation devices. We got the distribution of the corn granules within the separation devices by adopting the highspeed image technology, and then we obtained the data records of the two kinds of separation devices at different turning velocities and feed quantities. Both the simulation results and the experimental results shows that the new separation device raises the transport efficiency, especially at high speed and big feed quantity. When the speed becomes higher, the transport efficiency of the original separation device gets closer to the new separation device,but the efficiency of the new separation device is still higher,the efficiency gap of the two kinds of separation devices becomes bigger again at the speed of 3500r/min; when the feed quantity becomes bigger and gets closer to the nominal rating, the efficiency gap of the two kinds of separation devices becomes bigger too,because the new separation device not only uses a new reasonable shape,but also becomes smaller than the original one. So the new separation device is effective for energy saving and consumption reducing especially at high speed and big feed quantity. This research will play an important role in energy saving and consumption reducing of feed production. It also provides a theoretical reference for the design of the separation device.