Crop rhizome cutting device

The utility model belongs to the technical field of agricultural machinery, and discloses a crop rootstock cutting device which comprises a supporting piece and a rootstock cutting assembly, the supporting piece is used for being supported on the ground, and the rootstock cutting assembly comprises a mounting part and a rootstock cutting part connected to the mounting part. The installation part can reciprocate in the vertical direction relative to the supporting piece so as to drive the rhizome cutting part to repeatedly press rhizomes of crops in the vertical direction to cut off the rhizomes, and therefore the rhizomes are cut off in the mode that the rhizomes are repeatedly pressed in the vertical direction; the crop yield reduction caused by excessive cutting of rhizomes can be avoided; besides, the rhizome cutting-off part is provided with a notch, and the notch is used for the straw of the crops to penetrate through, so that the straw of the crops cannot be pressed and collided in the process that the