The application of prefabricated components (PCs) is accelerating the transformation of the traditional building model to the prefabricated building supply chain, and it also places higher requirements on suppliers. How to efficiently select high-quality suppliers has become an urgent problem for engineering general contractors. This paper fully considers the characteristics of prefabricated building and the elements of supplier selection, combining the Supply Chain Operations Reference (SCOR) model to analyze the process of prefabricated building. Based on the characteristics of prefabricated building and PCs, we establish a supplier selection evaluation index system for PCs of prefabricated building. Next, we construct a supplier selection evaluation model through Analytic Hierarchy Process (AHP) and Back Propagation (BP) neural network, and verify the feasibility of the model through sample data simulation sex. Hope to provide a scientific decision-making method for the selection of prefabricated building PCs suppliers.