Abstract: Aiming at problems of high labor intensity and low efficiency of traditional manual transplantation of cabbage，according to agronomic requirements of cabbage planting，2ZS-3 flexible disc cabbage transplanter which could replenish water for cabbage nude seedling transplantation was developed.The trajectory of seedling movement in process of seedling planting was analyzed and suitable seedling range was selected.The key components such as seedling feeding device，flexible disc device，ditch opener，earth covering and pressing device were designed and design parameters were determined.After field test，it was found that all indexes met standard requirements.