Abstract: Rotary cultivator is a primary cultivating machine in many countries. It can efficiently complete the operations of soil mixing, turning, pulverizing, puddling and leveling, and thereby create good seedbeds for crop growing, while it is always challenged by the large power requirement. Therefore, it is urgent to need some methods to solve these problems. The proper optimization of rotary tillage blade geometry could help to reduce the power requirement and improve the tillage quality. Mole rats have the outstanding digging performance, and their multi-claw combination and the contour curves of claw tips would inspire the development of new efficient rotary tillage blade. By the observation and measurement, it was found that multi-claw combination was a kind of combined narrow tooth structure, and quadratic gauss equation could accurately fit the contour curves of the five claw tips (R2 > 0.95 and SSE < 0.05). Based on these characteristics of the multi-claw combination and the contour curves of claw tips of mole rats, the bionic rotary tillage blade was designed for reducing the tilth torque and power. And the field test was conducted at different forward velocities, rotary speeds and tillage depths for obtaining the power and tillage quality of the bionic rotary tillage blade. The conventional blade was as the control group for comparing the results with the bionic blade. Results showed that on average, the power of the bionic rotary blade cultivator was reduced by 16.88% when the forward velocity increased from 1 km/h to 5 km/h, and the power of the bionic rotary blade cultivator was decreased by 17.00% with the rotary speed increasing from 254 r/min to 267 r/min, then the power of the bionic rotary blade cultivator was diminished by 21.80% with tillage depth increasing from 80 mm to 160 mm. Especially, the bionic rotary cultivator could significantly reduce the risk of smearing on the furrow bottom, form a flat furrow bottom and achieve a lower power requirement result. On the contrary, the conventional blade had a little poor tillage quality. All of these were due to the better penetration and sliding cutting performances of the claw tips and the smaller soil failure wedge produced by the multi-claw combination. Moreover, the field tillage performance of the bionic rotary blade cultivator including ratio of soil breakage the depth stability, stability of tillage width, vegetation coverage, soil surface flatness after tillage and soil looseness, had no big differences with those of the conventional blade, and all these met the requirements of the national standard of China. In sum, the bionic geometries had an important role on the torque and power reduction of rotary tillage blades; further, they also could improve the tillage performance.