User engagement is the promotion and extension of relationship marketing paradigm based on the theoretical background of prosperous behavior of social network platform development and service-oriented logic. The connotation of active participation and enthusiastic interaction has become the formation motivation of user value co-creation and behavior intention, and has gradually replaced customer satisfaction as an important influencing factor of repurchase. This paper takes micro-blog as the representative of social network platform and value co-creation as the intermediary variable to study the influence of different dimensions of user engagement of social network platform on members’ repurchase intention. The research shows that: the conscious participation, enthusiasm and platform interaction of social network platform users have a significant positive impact on members’ repurchase intention; Value co-creation plays a part of intermediary role in the process of the impact of user engagement on members’ repurchase intention.