In order to shorten the filtration period of wort in the lauter tun and improve the quality of wort, A bionic raking knife suitable for the operation of the lauter tun was designed. The biological model of mole cricket claw teeth of its digging foot was reconstructed, and the dynamic process of claw teeth wedging into soil was simulated. According to the simulation results, the claw tooth T4 has the highest similarity with the design objectives of raking knife. The key contour curve is extracted from the biological model of claw tooth T4, and the curve formula is fitted with the coordinates of several points of the curve, and the fitted curves are generated. The fitting curves are applied to the design of plow contour line of bionic raking knife and the main contour line of horizontal section of blade board. Finally, the design scheme was verified by simulation. The results show that, compared with the prototype, the maximum shear stress on the surface of the raking knife is reduced by 18.90%; the maximum shear stress on the inner wall of the lauter tun is reduced by 19.01%; and the maximum fluid velocity is reduced by 11.46%.