This study aims to examine the causal relationshps between self-efficacy and job satisfaction of young farmers by verifying the mediating effect of self-efficacy in the relationship between job ability and job satisfaction of young farmers, and to improve the job ability necessary for agriculture, and to provide implications for the development and operation of curriculum that meets the needs of farmers. To this end, an online survey was conducted on 300 young farmers under the age of 40 among 4-H members in Korea from June 17 to 28, 2022. The results of the analysis to find out the mediating effect of self-efficacy in the relationship between job ability and job satisfaction of young farmers are as follows. First, it was verified that self-efficacy plays a partial mediating role in affecting job satisfaction by verifying whether the job ability of young farmers mediates self-efficacy in the relationship between job satisfaction and job satisfaction. It can be said that the higher the job ability, the more positive the job satisfaction and the more positive the self-efficacy, which ultimately has a positive effect on job satisfaction. Second, as a result of verifying whether self-efficacy is mediated in the relationship between job satisfaction and job satisfaction by sub-factors of job competency in detail, self-efficacy plays a partial mediating role between agricultural production ability, agricultural machine management ability, and job satisfaction, and agricultural management ability and agricultural information utilization ability do not have a direct significant effect on job satisfaction.