In order to reduce the consumption power and improve the working performance when corn snapping unit is working, the overall structure of corn snapping unit was designed, then the key structure and kinematic parameters were analyzed in theory. After that, the 3 D model of corn snapping unit was established by using Pro/E according to the design parameters. Finally, the power and noise level were tested at the different rotate speeds in testing bed. The results showed that the consumption power and noise level were too high when this corn snapping roll was working without load. After changing the finger rotor, the consumption power rose at low speed and dropped at high speed in contrast to before changing.