Plough for excavating crop underground rhizomes

The utility model provides a plough for excavating crop underground rhizomes. The problems that the position relative to a cross beam of a ploughshare of an existing plough is fixed, so that operation is not convenient, and the existing plough is not suitable for excavating the crop underground rhizomes are solved. A stand column (1) is fixedly connected with a cross beam (2), and a gear plate (4) is fixedly connected with the stand column. The gear plate (4) is provided with a row of horizontal teeth which are matched with a shifting gear handle (7), and a limiting handle (6) is connected with the gear plate. A sleeve (16) is arranged at the lower end of the stand column, and a shaft (8) of a ploughshare (19) penetrates through the sleeve (16) and is connected with the lower end of the shifting gear handle (7).