Abstract: 1GK-210 type amphibious rotary cultivator was designed.Overall structure was introduced.Main technical parameters were determined.And innovative design of rotary knife roller and plate device was made.This rotary cultivator was not only suitable for paddy field with neutral clay quality in the south of China to complete ploughing，burying stubble，crushing soil，starting pulp，round levelling fields and so on，but also was applicable to dry land grain crop straw returning operation，effect of tillage could meet agronomic requirements of grain crops.