Abstract: At present, there are problems in the process of banana straw crushing, such as extensive tool wear, tool breakage, and poor tool adaptability during use. This paper combined the physical characteristics of banana straw with high water content and rich fiber content. Based on the principle of bionics, this paper was inspired by wolf claws to obtain the curve equation of the contour curve of the imitated wolf claws and process a bionic drag reduction straw crushing knife. The banana straw crushing cutter shaft was designed. The forward speed of the returning machine, the rotation speed of the cutter shaft, and the thickness of the blade were studied by using the central combination test design theory. Design-Expert conducted data processing and established a mathematical regression model of the qualified rate of straw crushing and performed variance analysis. The analysis showed that the significant sequence that affects the qualified rate of straw crushing was the rotation speed of the cutter shaft, the thickness of the blade, and the forward speed of the returning machine from large to small. The optimal combination of operating parameters obtained by the response surface method was: the forward speed of the returning machine at 4.72 km/h, the rotation speed of the cutter shaft at 1 626.67 r/min, and the blade thickness at 9.84 mm. At this time, the qualified rate of straw crushing was 97.28%. In the case of the optimal parameter combination, the actual qualified rate of straw crushing was 96.94%. Through a comparative test with a straight crushing knife, it was concluded that the straw crushing qualification rate had increased by 2.34%. This research provided a reference for improving the operational quality of banana straw crushing machines.