Based on social capital theory, this paper analyzes the influence mechanism of six dimensions of manufacturing enterprise’s social capital on service innovation performance, with a total of 168 samples, an empirical research is used to test the theoretical model. Results reveal that: manufacturing enterprise’s social capital can enhance service innovation performance and knowledge management, knowledge management can enhance service innovation performance too, knowledge management play a mediation role between manufacturing enterprise’s social capital and service innovation performance. Our study provides theoretical and managerial implications for manufacturing enterprise in promoting service innovation performance.