In order to solve the problems of deep soil silt layer and easy trapping machine in the paddy field under the shrimp-rice co-cultivation mode, a comparative test was carried out between the self-propelled rotary tiller and the wheeled tractor. The results showed that the operating efficiency of the crawler self-propelled rotary tiller is slightly lower than that of the wheeled tractor, but the soil crushing rate is increased by 4.9 percentage points, the ploughing depth is increased by 2.3 cm, and the body sinking depth is reduced by 11.1 cm. The flatness after operation is better than that of the wheeled tractor. In addition, there is no field trapping phenomenon in the crawler self-propelled tractor, which reduces the crushing of the field soil by the tillage machine and protects the soil structure of the tillage layer.