This study investigated the effects of SW-efficacy on computational thinking STEAM literacy and the dual mediation effects of interest and student engagement in the relationship between SW-efficacy, computational thinking and STEAM literacy in robot-utilized SW convergence education. For achieving this purpose, robot-utilized SW convergence education targeting 146 middle schools students were carried out, post-survey regarding SW-efficacy, computational thinking, STEAM literacy, interest, and learning engagement were conducted. Collected data were analyzed by SPSS macro process for analysis of the dual mediation effect. Results were as follows: first, SW-efficacy had a significant effect on computational thinking and STEAM literacy. Second, interest did not mediate the relationship between SW efficacy, computational thinking and STEAM literacy, while student engagement mediated it. Third, SW efficacy had a significant effect on computational thinking and STEAM literacy dual-mediating effect of interest and student engagement. These results imply the roles of SW efficacy, interest and student engagement to improve computational thinking and STEAM literacy in robot-utilized SW education and provide implications with regard to robot-utilized SW education and instructional directions.