The invention relates to a deep-
rhizome crop harvester. The deep-
rhizome crop harvester comprises a rack, a transmission device, a
deep excavation device and a transport device, wherein the transmission device provides power for a main shaft of the
deep excavation device so that the main shaft rotates; the
deep excavation device further comprises a supporting frame, a driven shaft, at least one
ridge cutting mechanism and at least two ditching mechanisms, the end, close to the rack, of the supporting frame is provided with the main shaft, the end, close to the rack, of the supporting frame isrotationally connected with the rack, the end, away from the rack, of the supporting frame is provided with the driven shaft and connected with the transport device, the
ridge cutting mechanism is fixed on the driven shaft and rotates along with the driven shaft; each ditching mechanism comprises a large chain wheel, a ditching chain with a chain cutter and a small chain wheel, the large chain wheel is fixed on the main shaft, the small chain wheel is fixed on the driven shaft, the ditching chain drives the small chain wheel to rotate, the
ridge cutting mechanism is arranged between the smallchain wheels of the adjacent two ditching mechanisms, and the ridge cutting mechanism is provided with blades used for cutting ridges. The deep-
rhizome crop harvester has the advantages of good excavation quality and high harvesting efficiency.