The purpose of this study is to examine the effect of lifelong education practitioners’ reflective learning on professionalism and the mediating effect of occupational identity and work engagement between the variables. Based on these objectives, the study questions were established as following: First, to analyze the relationships and related differences between the variables of reflective learning of lifelong education practitioner, occupational identity, work engagement and professionalism. Second, mediating effects about occupational identity and work engagement were analyzed in the relationship between reflective learning and professionalism. In order to verify these study questions, total of 317 survey questions were provided and final 303 survey data were used. Identified study results through these procedures are as follows. First, in the relationship of lifelong education practitioners’ reflective learning on the professionalism, the reflection variable had a significant positive effect on the professionalism. On the other hand, non-reflection variables had a significant negative effect on professionalism. Second, occupational identity and work engagement had a positive effect on professionalism. Third, as a result of verifying the mediating role of reflective learning and professionalism, the mediating effect of occupational identity and work engagement was confirmed. Based on the research findings, recommendations were addressed.