The rototiller of 1GXNB-140 type is a piece of farming machinery supporting for the tractor with horse power from 12 to 80. The main components consist of rack, gearbox and rotary blade. Driven by intermediate gear, the distinctive feature of rototiller is the gear box has shift fork. Moreover, two different speeds can be achieved contributing to the rotary blade. The wheelmark will be completely covered by adopting the techniques of broader farming width and symmetric suspension. The rototiller is suitable for dry land farming with characteristics of time saving, labor saving, high quality and low cost.