A rape windrower was designed. The main structure and the working process of the machine were determined，including the structure design and the analysis of the key components such as the convey system, the separating system and the cutting device. A kind of convey system, which included telescopic cylinder, vertical cylinder and conveyor was designed and it could achieve the middle of the vertical placement of 1 000 mm. The cutting height can be adjusted to 200-450 mm by hydraulics equipment. The rape windrower can meet the requirement of segment harvest and was designed reasonably through experimental verification. It can extend the harvest season of rape effectively, which can not only reduce the loss rate of rape but also increase the economic efficiency.