Abstract: In view of demand of mechanized harvesting of millet in hilly, mountainous and plain areas in China, 4LZG-1.5 small self-propelled millet harvester was researched and designed．Four-wheel chassis suitable for working environment in hilly and mountainous areas was adopted．And it’s trafficability was good．Special crop holder and extended profiling header were designed to solve problems of large header loss and difficult harvest．Combined threshing cylinder of " striped bar + plate teeth + nail teeth", and small hole mesh screen separation mechanism were adopted to solve problem of difficult threshing and cleaning of high wet millet．Field test results showed that total loss rate was 4.5%, grain impurity content rate was 2.2%, and crushing rate was 3.1%．All the performance indicators met design requirements．It provided equipment support for mechanized harvesting of millet and other miscellaneous grain crops in China．