Self-propelled boat for harvesting lotus root

The utility model belongs to a self-propelled boat for harvesting lotus root, the boat comprises a boat body and a momentum, water force, transmission and control devic provided on the boat body, characterised in that the boat body is also provided with excavate devices, an impeller type walk device and a water storage cabin; the boat body has a flat bottom; two excavate devices are arranged symmetrically on a boat bow along a vertical axes line of the boat body, and the excavate devices are composed of a spiral organ, a lever assembly, a slipway assembly, a slide rop assembly, a water jetting pipe assembly and nozzles which is position at the boat bow and under the water to move in a horizontal line to and fro; two lamina-shape walk wheels are fixed at two sides of the boat body respectively; the spiral organ is fixed on an front end of the boat body to drive the lever to be swung; then the lever drives the two group of nozzles to comparatively shift bidirectionally under the water and close to the surface of silt by the slipway, and high-pressure water column is jetted from the nozzles to cut, brush and knap the soil, thereby lotus roots are automatically floated on the water. The vertical positions of the nozzles and jetting angle can be adjusted.