To meet the demands of modern information-based teaching in elementary education, blended teaching is gradually being promoted in English teaching. However, high school English writing still faces issues such as outdated teaching methods, limited teacher-student interaction, and insufficient writing feedback. This paper examines the application of blended teaching in high school English writing by analyzing these problems. To improve students’ writing skills, teachers must adopt new teaching concepts, fully leverage online resources and writing platforms, encourage students’ participation, promote diverse classroom interactions, and provide timely feedback. By doing so, high school English writing teaching can be effectively enhanced through blended teaching.