The invention discloses a potato semi-combine harvester comprising a frame, wherein the front end of the frame is provided with a traction device for pulling the frame. The potato semi-combine harvester further comprises a hydraulic lifting device, a frame, cutting devices, an excavating device, a hydraulic oil gearbox, a first hydraulic motor, a second hydraulic motor, a first conveying device, asecond conveying device, a hydraulic oil tank, a platform device, a collecting device, and a traveling device, wherein a mounting frame is disposed on both sides of the front end of the frame, and isrotationally connected with the frame through a pin roll, the cutting devices are arranged on both sides of the mounting frame; the excavating device is mounted on the bottom of the mounting frame between the two cutting devices; the hydraulic oil gearbox is mounted on the frame behind the mounting frame; the hydraulic oil tank is arranged at the front end of the frame; and the hydraulic oil tankis connected to the oil inlets of the first hydraulic motor, the second hydraulic motor and the hydraulic lifting device through oil pipes. The potato semi-combine harvester facilitates the harvesting of potatoes, improves harvesting efficiency, and saves manpower.