The aims of this study are to examine the research trends of journal articles on elementary, middle, and high school English textbooks based on the 2015 revised national curriculum and to explore implications for future related research. To this end, 110 academic papers on English textbooks were collected using KCI(Korea Citation Index), and they were classified by school level, year of issue, language skills, research topics, and textbook components. According to the research results, English textbooks in elementary schools were studied the most, and the articles on English textbooks were published the most from 2019 to 2021, during which the 2015 national curriculum came into full force. Second, reading, vocabulary, culture, and integrated language skills were the most focused language skills in the articles on English textbooks. Thirdly, among seven research topics on English textbooks, most of the articles were found to be focused on content analysis. Thus, research on textbook selection, teaching methods, and teachers’ perception of textbooks needs to be conducted in the future. Lastly, the textbook components mainly studied were teaching and learning activities, continuity and systematicity, culture, vocabulary, and functions, so content topics, language forms, authenticity, and evaluation also need to be addressed in future research. Finally, the limitations of the study were discussed.