The study is conducted by using the data of Chinese General Social Survey to test the impact of subjective class identification and class mobility perception on citizenization of the migrant agricultural population. The level of citizenization is higher among the migrant agricultural population with a higher sense of subjective class identification, and the upward mobility of the class can also improve the level of citizenization. The mechanism analysis shows that family stratum and self-assessment of socioeconomic status play a moderating and mediating role in the influence of subjective class identification on citizenization level respectively. Analysis of heterogeneity reveals that the subjective class identification of the older generation and female migrant agricultural population has a greater impact on the level of citizenization, and there is a greater potential in the central and western regions for citizenization. Therefore, diversified social platforms should be built for the migrant agricultural population to unblock the upward mobility. Emphasis should be placed on the older generation and female agricultural population. In the central region, integration of household registration can be explored and nearby citizenization should be encouraged. For the western region, the class status of migrant agricultural population should be maintained, so as to promote a coordinated development of citizenization in different regions across the country and improve the quality of new urbanization.