In view of the problems of material blockage, accumulation and the sunflower plate can not enter the header due to the reel rewind in the domestic oil sunflower combine harvesters, according to planting model and agronomic requirements of oil sunflower in China, a special header for oil sunflower combined harvesters with low loss was designed. The analysis was carried out on the posture of the sunflower stalks during the dividing process to determine the width and length of the inner divider and the inner divider gap. Selecting different values of reel speed ratio λ to carry out simulation analysis to the reels motion trajectory in order to determine the range of reel speed ratio and get the optimal diameter and speed of reel. In order to reduce the impact of the dial finger on the sunflower disk during the conveying of the auger, and prevent the sunflower stalk getting entangled on the auger, a scraper conveyor auger was designed. The cutting speed of the reciprocating cutter was determined by the knifetomachine speed ratio γ to ensure a good cutting effect. For evaluating the actual harvest effect of oil sunflower harvester, a field experiment was carried out in Henan Zhuangzi Village, Fukang City, Xinjiang Uygur Autonomous Region. The forward speed of the whole machine was 0.8m/s, the feed rate was 3.3kg/s, and the average loss rate of the header was 1.42%. The operation of the whole machine was stable during the harvesting operation, and there was no accumulation and blockage of the inner and outer dividers, conveying auger feeding smoothly and without entanglement, and there was no return of the oil sunflower plant at the reel, which met the design requirements of the oil sunflower combine harvester header.