Using social platform to build product quality supervision system is an important means to enhance the efficiency of government supervision. This paper constructs a tripartite evolutionary game model involving government, enterprises, and consumers in the participation of social media platforms. The results indicate that information intermediary, reputation, and administrative intervention effects are the key factors for social media to play a supervisory role, and exert influence on the quality behavior of enterprises through focusing effects, amplifying effects, and reputation effects. Finally, the paper puts forward some suggestions on how to exert coordinated supervision.