The utility model discloses a mechanism is planted to differential train rice pot width course. Transverse offset was too big when the seedling was got in the existence of present planetary gear train alms bowl width of seedling shoot narrow row transplantation mechanism, led to the fact the seedling problem of accuracy inadequately of getting. The utility model discloses a differential train is two -freedom -degree mechanism, and the transmission case is interior to be adopted fixed transmission ratio 's knuckle -tooth wheel or adopt not constant speed transmission's non -circular gear, adopts the gear combination of non -circular gear and crisscross helical gear in the gear box. The utility model discloses a transplant the arm and still receiving gear engagement pivoted drive power along with gear box pivoted in -process, realize that the differential rotates, because the not constant speed transmission characteristic of differential train central africa knuckle -tooth wheel and the nimble drive ratio that obtains, combine the space transmission characteristic of crisscross helical gear, when realizing that the orbit is transplanted in complicated space " 8 font ", guarantee that the seedling section of getting of transplanting the orbit does not have lateral shifting, realize " directly pressing from both sides the seedling " promptly.