English writing is a manifestation of the comprehensive English ability of junior high school students, and it is also one of the skill requirements of listening, speaking, reading and writing in the new curriculum standard. However, the current situation of junior high school students' writing is not optimistic, and teachers do not pay enough attention to writing teaching. At present, many experts, scholars and teachers have begun to pay attention to writing teaching, and have explored the application of many instruction models in writing teaching. Among them, the scaffolding instruction model is a very effective instruction model. This model is based on constructivism, combined with Vygosky's "Zone of Proximal Development" theory, emphasizes the use of students' subjectivity, promotes students' self‐knowledge construction and meaningful active learning, and improves students' English writing skills. This article mainly discusses the current situation of junior high school English writing teaching, combined with the scaffolding instruction model, and proposes some teaching strategies for junior high school English writing teaching for the reference of teachers.