PROBLEM TO BE SOLVED: To provide a field grooving machine that can operate a movement mechanism including a driving source by operation means, can groove drainage in multiple interrow spaces or hill spaces of the field surface with a grooving body by moving a machine body by the operation means, also can prevent waterway blockage of intersecting drainage finished with grooving, can maintain mutual waterways of the intersecting drainage, and can groove drainage having good drainage function.SOLUTION: A machine body 1 is provided with a waterway opening mechanism 9 for preventing the waterway blockage of the grooved intersecting drainage due to waste soil of both side positions of the drainage W with grooving movement by collapsing the waste soil.SELECTED DRAWING: Figure 1
