This potato seedling killing machine mainly by frame, land wheel, kill the seedling arbor, kill parts such as seedling sword, traction frame, gearbox, final drive shaft, side transmission shaft and constitute. Two land wheel symmetries set up in the rear side of frame, and the traction frame sets up to be put in the position of going forward of frame, and the complete network of the tractor suspension device of being convenient for pulls. Tractor power output shaft passes through the universal joint and is connected with the gearbox, and the gearbox reaches the both sides belt pulley through the both sides transmission shaft with power, kills the seedling axle through the belt drive drive, and then drives to articulate and make high -speed rotating motion killing the epaxial seedling sword that kills of seedling, high -speed rotatory kill the seedling sword with stem seedling and weeds cutting, smash, diversion separator plate divides the furrow to both sides with seedling and weeds. The utility model discloses a ridge shape design mode is imitated on four ridges, can comparatively effectual improvement kill the seedling operating efficiency, and it provides the guarantee to gather in the crops for the high -efficient high quality of potato.