The purpose of this study is to understand the professionalism of secondary law-related education teachers and to find ways to development the professionalism of law-related education teachers by linking it with the teacher training system. Teachers have long expressed difficulties in the lack of professionalism of law-related education, but since teacher professionalism is a complex and multidimensional concept, it is not possible to discuss ways to development it fragmentarily. Therefore, this study attempted to approach the professionalism of law-related education teachers from the beginning by synthesizing the curriculum of the College of Education aimed at cultivating professionalism in law-related education itself and the perceptions of teachers. As a result of the analysis of the training system and related perception of the nationwide College of Education, teacher professionalism in law–related education is distinct from the competence of legal scholars and legal experts, and content knowledge and pedagogical knowledge are organically formed. In consideration of this, the following suggestions were made to improve the curriculum of the College of Education to enhance the professionalism of law–related education teachers. First, the organization and opening of lectures in the law–related education of the College of Education should be expanded from a quantitative perspective so that teachers can manage a vast area of law in class. Second, fine-tuning of the contents and organization order of lectures in the law–related education of the College of Education should be made in terms of quality through the development of a standard curriculum for training law-related education teachers.