The side-discharge potato harvester can be used in conjunction with a combine harvester to achieve a 2 rows + 2 rows or 2 rows + 2 rows + 2 rows mode. Up to 6 ridges of potatoes can be harvested at the same time. It not only protects crops and improves screening efficiency, but also significantly improves the productivity of subsequent potato harvesting work. The potato digger is suspended from the tractor through a 3 point suspension system. The main parts are as follows: Limit wide disc knife is mainly composed of a disc knife, a fixed frame, a compression spring and a regulating device. The disc knife is driven by no power, and is mainly used to cut the surface along the ridge along with the weeds. Deepening device mainly by the profile limit wheel, bracket, adjust the body composition, profiling limit wheel is used to control and adjust the excavation shovel excavation depth, and make potato, soil loose, conductive to the late soil separation.