The invention discloses a tobacco stem drawing machine, comprising a transmission mechanism, an excavated hack rotor mechanism, a protection guide guard board mechanism, a depth controlling mechanism, a connection mechanism, and a placing and supporting bar, wherein the excavated hack rotor mechanism is composed of a regular triangular knife rest, a blade and a protection ring; the rotating direction of the excavated hack rotor is contrary to the rotating direction of tires of a tractor; the blade is a rectangular blade; the blade is provided with a cutting edge; the angle between the blade and the corresponding side of the knife rest is 5-15 degrees; and the included angle between the protection guide guard board and the ground is 5-15 degrees. The tobacco stem drawing machine in the invention can continuously evacuate the tobacco stem out of the tobacco ridge integrally, further remove the soils attached on the roots, place the stems in the field regularly, have little damage to the tobacco stem, completely change the working way of drawing the tobacco stems manually, and greatly improve the labor production efficiency so as to realize mechanical work of drawing the tobacco stem.