In response to the problems of low efficiency, poor quality, and inapplicability to high moisture content grass in existing grass kneading machines, a collaborative cutting and crushing grass kneading machine was designed for alfalfa processing. Theoretical analysis was conducted on the cutting and crushing processes, and the overall structure and key component structural dimensions of the wire kneading machine were determined through design calculations. A single factor experiment was conducted with motor output speed, mesh diameter, feed rate, and moisture content as experimental factors, using productivity and spinning rate as performance evaluation indicators. A quadratic orthogonal rotation combination experiment was conducted by using alfalfa with moisture content of 65% as the processing object, with motor output speed, sieve diameter, and feed rate as experimental factors. The single factor experiment determined the range of experimental factors and explored the silk kneading effect of the silk kneading machine on alfalfa with different moisture contents. Response surface analysis, regression analysis, and objective optimization were conducted on the experimental results of the quadratic orthogonal rotation combination experiment by using the Design-Expert 12.0 software. The regression equation between the experimental factors and evaluation indicators was obtained. With the goal of maximizing both productivity and silk rate, multi-objective optimization was carried out on the output speed, mesh diameter, and feed rate of the motor. The optimal parameter combination was determined as follows: the output speed of the motor was 443.77r/min, the sieve diameter was 14mm, the feeding amount was 1.27kg/s, and the validation test of wire rolling showed that the production rate was 5065.98kg/h, and the silk rate as 94.87%. The device had high silk kneading efficiency, good quality, which can knead grass with high moisture content, meeting the design requirements of the grass kneading machine.