Abstract: With continuous development of seed sorting technology, requirements for automatic sorting technology in seed sorting process were getting higher and higher．In order to improve efficiency of seed sorting and automation level, reduce loss and energy consumption, a new intelligent specific gravity seed sorting control system based on single-chip microcomputer was proposed．The system used single-chip microcomputer control to not only improve efficiency of seed sorting, but also has a variety of safety guarantees, such as data visualization, sound and light alarm, etc．Combined with seed sorting process, firstly, a set of detailed design scheme of control system software and hardware was clarified, and then test device was built, data test of system dust removal and vibration effect was carried out．Experiment showed that in experimental time of 2 min, when average wind speed of sieve surface was 2.01 m/s and frequency of vibrating motor was 55 Hz, there was no large-area impurity accumulation phenomenon on sieve surface, which could realize sorting of light impurities and excellent seeds in grain, and grain seed sorting effect was the best．