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Field rotary tillage is an important part of the agricultural production process. In order to reduce the energy consumption during rotary blade farming, based on the characteristics of the contour fitting curves of the forefoot toes of Gryllotalpa orientalis Burmeister, using reverse engineering technology, the contour curves of the first, second, third and fourth claw toes of the forefoot were arranged in sequence on the cutting edge and the end edge of the gyration radius of the IT245 national standard rotary blade to design a bionic rotary blade. A soil-rotary blade interaction model of the southern clay-wet soil-blade was established to analyze the changes in torque and three-axis working resistance of the national standard and bionic rotary blade at different rotate speeds. Combined with the indoor soil bin test, the trend of the torque on the tool shaft was analyzed to verify the validity of the discrete element simulation model. The force simulation analysis of a single blade showed that the horizontal resistance, vertical resistance and lateral resistance of the national standard and bionic rotary blade were all gradually increased with the increase of speed. At three different rotate speeds, except for the lateral resistance, the maximum horizontal and vertical resistance of the bionic rotary blade were lower than that of the national standard rotary blade. Compared with the national standard rotary blade, when the rotate speed was at 150r/min, 200r/min and 250r/min, the maximum horizontal resistance of the bionic rotary blade was reduced by 9.91%, 5.78% and 4.95%, respectively, and the vertical resistance of which was reduced by 9.09%, 9.74% and 6.38%, respectively. The soil bin torque test showed that the simulation and experimental values of the two rotary blades had the same changing trend. The torque was gradually increased as the increase of rotate speed, and the maximum relative error was up to 13.23%. Compared with the national standard rotary blade, when the rotate speed was at 150r/min, 200r/min and 250r/min, the average torque of the bionic rotary blade was reduced by 10.53%, 4.46% and 3.49%, respectively. The research results can provide a certain reference for the analysis of drag reduction and energy consumption of the rotary blade.