Objectives This study aimed to structure the content framework of a middle school character education curriculum by grafting design thinking and to develop a character education program. Methods The developed program was applied within the school and supplemented by receiving feedback, and the effectiveness of the program was verified using a paired-sample t-test in a single group pre- and post-test. Through this, the degree of students' character literacy development and the adequacy of the program were evaluated. In addition, we analyzed the opinions collected through opinion surveys and personal interviews of students who participated in each character education strategy. Results The detailed results of research and development are as follows. (1) Construction of middle school character curriculum content system grafting design thinking, (2) Establishment of middle school character curriculum types grafting design thinking, (3) 9 programs of middle school character education grafting design thinking, (4) The design content of the middle school character education program grafting design thinking, (5) The degree of character literacy cultivation. In these five aspects, the validity and effectiveness of the middle school character education program graftin design thinking was confirmed. Conclusions Firstly, a curriculum for systematic and comprehensive character curriculum is needed for the holistic growth of students. Secondly, combining character education and design thinking creates a synergistic effect. Thirdly, character education must be strengthened through cooperation between schools, families, and communities. Fourthly, policy support and improvement of the educational environment are essential.