Nowadays, huge quantity and various kinds of municipal solid waste (MSW) are collected mixing together without separating in China. There are wastes such as plastic, glass, metal, chemical fiber, paper, food and so on that can be regenerated and reused after sorting to realize sustainable development. However, because MSW are complex mixtures and with high moisture content, results in that useful substance can’t be sorted entirely, to research efficient equipments successfully is the key to solve this problem. Aiming at wastes easily to wind and hook each other such as cloth, strings, plastic and so on, a new sorting equipment was designed. Some key parts of the equipment were analyzed and optimized by using design calculation, finite element method and kinematic simulation method, including the structure optimum of the cam, and kinematic simulation and analysis of reset springs to promote the performance and reliability.