The State Grid plays an important role in the development of national economy. Choosing high-quality supplier cooperation is a prerequisite for providing quality services. Many experts and scholars have made many contributions to the management of suppliers, but there are still problems that solve the problem unitarily and subjective factors are too strong. According to the multi-application and research status of supplier management in the project, a user portrait-based supplier management scheme is proposed, which mainly assists the supplier's credit score, supplier product selection, and supplier's long-term cooperation feasibility through user portraits. The article mainly elaborates on the labeling system and content of the portrait, and focuses on the analysis of the model label generation method based on natural language processing. Combined with the supplier product selection case, the application method of user portrait in assistant decision-making is briefly described. It proves that the method based on the portrait can improve the accuracy of supplier selection and simplify the business process.