Various factors concerning design and producing need to be taken into account while designing and configuring the processing scheme of complex mechanical equipment. The quality of the processing scheme is directed related to the quality and function of the products. It is of great significance to make effective processing schemes for complex mechanical equipment processing. Thus, based on research and analysis of design and configuration of processing schemes of complex mechanical equipment, this paper presents a design and configuration model for designing processing scheme of complex mechanical equipment based on polychromatic sets theory. It obtains various designs and configuration schemes up to the standard of processing through using the concept of polychromatic graph and polychromatic set algorithm, and evaluates potential processing schemes based on multi-attribute fuzzy evaluation, to achieve the best processing scheme for complex mechanical equipment. Finally, this paper proves the efficacy and feasibility of the algorithm and the model through examining specific and concrete schemes.