The invention belongs to the field of agriculture machinery and discloses a collection-type potato stalk cutting machine comprising stalk cutters, cutter shafts, a frame, a suspending frame, a transmission chain, a left power output shaft, a gearbox, a right power output shaft, large belt wheels, a protection cover, a stalk collecting box, adjusting arms, small belt wheels, walking wheels and a conveying mechanism. The cutter shafts are arranged below the front of the frame, and the stalk cutters are arranged on the cutter shafts in a spiral manner, and two cutters are mounted in the same row. The gearbox is mounted above the front of the frame, the conveying mechanism is mounted on the middle rear portion of the frame, the stalk collecting box is arranged below the conveying mechanism, and the walking wheels are arranged on two sides of the middle of the frame through the adjusting arms. According to the collection-type potato stalk cutting machine, the stalk cutters which are mounted in the same row and which are distributed in a spiral manner are adopted to cut and throw the potato stalks to the rear conveying mechanism, the transmission chain is adopted to drive the conveying mechanism to convey the stalks to the stalk collecting box, the adjustable walking wheels are adopted to adjust the operating height of the whole machine, and the operation adaptation of the machine is improved. The collection-type potato stalk cutting machine is reasonable in structure, has high operating reliability and adaptation, and is adaptive to stalk cutting procedure before potato harvest.