The objective of this article is two-fold. First, this article explored the patterns of participation in lifelong vocational education and training (LVET) among vulnerable workers, i.e., irregular and temporary or daily workers, who are aged 25~64. Second, this article empirically analyzed the relationship between vulnerable workers perceptions about their socioeconomic mobility and participation in LVET. In order to accomplish these two objectives, using the 12th(2009)~19th(2016) waves of the Korean Labor and Income Panel Study, this article conducted descriptive statistics analysis and random effects panel probit regression analysis. The participation rates of the vulnerable workers this article explored ranged between approximately 2.8%(2012) and 5.4%(2009), with an average of 3.77% over the analysis period of this article. Also, while controlling for individual socioeconomic background and labor market conditions, the negative perception of socioeconomic mobility expectations is likely to lower the probability of participation in LVET by 0.4 percentage points(%p). Although this estimate is statistically significant at the 0.05 level, 0.4%p is presumably small in terms of the absolute extent to which the perception of socioeconomic mobility expectations influences the probability of participation in LVET. In addition, this article conceptually discussed possible reasons for the relatively inconsiderable statistical relationship between perception of socioeconomic mobility expectations and LVET participation.