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In view of the lack of suitable harvesting machinery for oil sunflower, the design and test of cutting machine for chain oil sunflower harvesting head were carried out. On the basis of expounding the structure and working principle of the cutter of chain oil sunflower cutting table, a rotary sawing blade was developed which had constant static slip angle and designed by using the mathematical equation of logarithmic helix, and the key structure and working parameters affecting the cutting performance were determined. The power consumption model of the sliding cutting process was analyzed to determine the selection range of the sliding cutting angle;the cutter’s track was analyzed, the speed range was defined. Based on the analysis of geometric cutting position of plant, the range of installation position of cutting knife was deduced. The result was obtained by single factor experiment under the condition that the slip angle was 50°~70°, the cutting speed was 750~1050r/min and the relative position was 100~300mm, the cutting power consumption was low and grain loss rate was less. The regression equations of the relationship between rotational speed, slip angle, relative position, and real-time power consumption and overall grain loss rate were constructed by quadratic orthogonal rotation test. By solving the regression equation, the optimum parameters were obtained as follows: the slip angle was 61°, the rotational speed was 750r/min and the relative distance was 180mm. At this point, the corresponding minimum power consumption value was 64.08W, and the grain loss rate was 1.24%. In order to verify the accuracy of optimal parameter combination, a bench test was carried out, experimental results showed that the actual cutting power consumption was 66.12W, the actual drop loss rate was 1.28%, the absolute error between the actual value and the predicted value was less than 5%, and the cutter met the requirements of low loss cutting of oil sunflower.