The present invention relates to a root-harvester for harvesting bulb crops. According to the present invention, a plow apparatus can be moved from left to right according to the width of a ridge where bulb crops such as sweet potatoes, potatoes, and onions are planted to adjust the area of plows suited for the width of the ridge, thereby providing the convenience of work. Bulb crops root-harvested by a plow blade can be also moved along a curved inner surface of a curvature blocking piece forming a bulb crop damage prevention member to prevent damage to outer surfaces of the bulb crops such as sweet potatoes, potatoes, and onions, thereby improving quality thereof. In addition, the length of a main frame with a plurality of plow apparatuses can be adjusted, thereby easily passing a narrow way while being mounted at a rear part of a tractor. Furthermore, the number of used plows can be selectively limited according to a number of ridges to be root-harvested, thereby improving workability.
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