Saline-alkali soil rotary drilling type shallow-dredging and deep-loosening machine

The invention discloses a rotary drill type shallow-dredging subsoiler device for saline-alkali soil. The rotary drill type shallow-dredging subsoiler device comprises a rack and a drill bit assembly. In the advancing process of the device in the saline-alkali soil, the hydraulic motor rotates to drive the drill bit and the auger blade to rotate, and meanwhile the hydraulic cylinder is shortened to drive the drill bit and the auger blade to move downwards to drill and cut soil. The drill bit assembly with the front row short and the rear row long is used for drilling and cutting soil of different depths, so that shallow dredging and deep loosening are achieved, and the advancing resistance of the device is reduced. A deep limiting wheel supporting device is mounted during operation in a dry soil environment, a deep limiting wheel is dismounted during operation in a paddy field environment, and a paddy field touch plate supporting device is used, so that the device is effectively prevented from sinking, and th