Abstract: Taking Futian Leiwo Gushen 4LZ-2 type combine harvester as basic model，a kind of sorghum combined harvesting device was researched and designed.Some key components including header，intermediate conveying device，threshing part and cleaning part were refitted and designed.Field tests showed that the harvesting device mounted on self-propelled grain combine could meet agronomic requirements of sorghum harvesting.Its operating performance indicators met design requirements.Its advantages were modern design，reasonable layout，compact structure and easy installation.And it had a good application prospect in sorghum planting area in China.