Today labor conflict has been occurring gradually, and the contradiction between labor and capital becomes severe in China. Based on the distinguishing of the contradiction and conflict between the labor and capital, however, on social network perspective, this paper divides employees informal network into four types such as contradiction relieving network with highly-centralized strong relation, which can reduce mass conflict, contradiction coordinating network with lowly-centralized strong relation, which can mitigate labor-capital conflict, contradiction strengthening network with highly-centralized weak relation, which can easily cause mass conflict, and contradiction activating network with lowly-centralized weak relation, which can easily cause single employee-capital conflict. We selected a firm facing adverse conditions as a study case to explore the effects of migrant workers’ informal network on labor conflict. The findings reveal that contradiction relieving network and contradiction coordinating network can reduce labor conflict respectively, yet contradiction strengthening network and contradiction activating network may enhance labor conflict. Strong relation between capital and labor should establish and maintain strong relation, the active role should be fully played in informal network of the employees so as to mitigate the contradiction between labor and capital and to reduce the development of the conflict between labor and capital.