Abstract: Aiming at the difficulties of forage and straw collection in process of commercialization and resource utilization，and current situation that land decentralized management，cultivated land area was small and not suitable for traction type bundling machine operation，self-propelled forage harvest bundling machine was designed.Overall structure and working principle of this machine were introduced.Function and structure of main working parts such as airframe chassis，walking system，cutting device and compression mechanism etc.were analyzed.Structure and design parameters of main component were determined.