In this paper, the microstructure of migrant worker’s interpersonal communication networks and the opinion leaders’ characteristics are analyzed from the indicators such as centrality, scale-free characteristics, structural holes by social network analysis. It shows that there are differences between migrant worker’s interpersonal communication networks in different information contents. Individual occupies different positions under different circumstances of interpersonal communication network. Node degree of the network is power- law distribution, with many structural holes in the network. The opinion leaders of migrant workers, with the characteristics of horizontal, singular, active and cohesive, occupy an important position to improve information dissemination.