There is mainly used for all kinds of seeds processing property test, can also be used to the seeds of a few high added value of choose and size of the clear grading. The machine is the wind screen structure, with before and after suction duct, can remove the dust, light shout and unfulfilled grain of seeds; there are installed three layer screen pieces as up, middle and down in the screen box, respectively for the separation of big miscellaneous, large seed, small miscellaneous and small seeds, then obtained good seeds from the main line crossing. By adjusting the screen box vibration frequency button, can adjust sieve surface material in the running speed of the machine, which regulates the screening of the quality. The dusty gas which is produced by wind is filtered then back out so that can protect the environment.