Social mobility is one of the core research topics in the field of sociology. Different from the objective social mobility，the subjective social mobility is more concerned with the individual’s subjective feelings on the flow experience and the impact of such feelings on the individual and the whole society. In this study，the sampling survey data of the Sense of acquisition （2018），jointly released by the Chinese Academy of Social Sciences and the Intellvision，were used to analyze the current situation of subjective social mobility and its impact on social mentality （people’s livelihood sense of achievement，life quality evaluation and social mentality）. The results show that the subjective social mobility of survey subjects is mainly short distance and upward flow，while the subjective social mobility of male，rural and high-income respondents is higher. Flow direction and flow amplitude have a significant impact on social mentality. When subjective social mobility is upward flow and the greater the range of flow，people experience a higher sense of livelihood，a better quality of life evaluation，and a more positive social attitude；while downward flow has the opposite effect.