Based on the related Pro/E software and the basic principle of forage harvester, the design of a rubbing forage harvester was coordinately combined double-disk saw tooth cutter, forced and sequential feeding device with the wheel-type cutter header. A virtual assembly model had been established, and model machine had been manufactured according to the fitted position. The effects of structure parameters and mobile parameters of cutter on the working performance have been analyzed, and determined reasonable working parameter on the basis of indoor service test. Experimental results show that 4QR type of rubbing forage harvester meets design needs completely, quality silage crops and high productivity.