A new banana-stem shattering and returning machine which was designed by using a roller to prevent fiber from tangling solved the problem of preventing the roller from being tangled by fiber in a better way. Field test showed that fuel consumption per unit time was reduced by about 4%, shattering rate improved by about 5%, and the banana-stem shattering quality and agronomic requirements were met. Through theoretical analysis and field test, the structures and main parameters of such key components as swinging cutters and cutter rollers were determined.