This article conducts research on the treatment of kitchen waste. The treatment of kitchen waste includes front-end, mid-range, and back-end. The main focus of this article is on the front-end treatment process, which is how to design a more efficient and reasonable kitchen waste crusher for front-end treatment of waste crushing. Therefore, this article first establishes the model structure of kitchen waste and the crushing boundary conditions of kitchen waste. Based on the boundary conditions and mathematical models, the research on the crushing mechanism of the crusher and the design of the crusher structure are completed. For the structure of the crusher, the main parameters that determine the crushing effect, such as the shape of the crusher roller teeth, the size of the roller tooth structure, and the intersection angle of the roller teeth, are optimized. Finally, the structure optimization of the crusher gear and the crusher tooth roller is determined through simulation and discrete analysis of the three-dimensional model.