Using data from the 2017 National Population Dynamics Monitoring Survey, this paper studies the impact and mechanism of dialect distance, urban inclusiveness, and their interaction on the social integration of migrants under the same framework. The study found that dialect distance hinders the social integration of migrants, while urban inclusiveness can promote social integration and can alleviate the negative impact of dialect distance. The mechanism analysis shows that dialect distance hinders the social participation and social interaction of the migrants, while urban inclusiveness weakens the negative effect of dialect distance while promoting the social participation and social interaction. Income is not the mechanism of action of dialect distance, and cross-dialect mobility instead increases the income of the migrants, which means that dialect distance hinders the flow and allocation of labor factors to maximize the marginal benefit.