Precarious work is characterized by flexible and nonstandard employment relations. It affects people's economic relationships and participation in social and political movements. Based on the data of the Hong Kong Panel Study of Social Dynamics 2015, this paper explores the influence mechanism of precarious work on political participation with political attitude as a mediator. The results turn out that, for precarious workers, there is a significantly lower probability of institutionalized political participation and a higher probability of non-institutionalized political participation. Also, the young precarious workers have a lower probability of institutionalized political participation and a higher probability of non-institutionalized political participation compared with the middle-aged and the elderly. It shows that political attitude is a significant mediator between precarious work and political participation.