As a key part of basic education, English education in primary schools is of great significance to the personal development of students and the construction of society and has received extensive attention from society. However, primary English education in underdeveloped regions of China is still relatively backward. In recent years, the rapid development of AI technology has realized information communication in education, which has become the key force in promoting the digital transformation of English classrooms in underdeveloped regions and the potential to bridge the education gap between areas. This paper is based on the teaching characteristics of the current primary school English subject, combined with the current development of AI technology applied to English teaching, for building the digital classroom of primary school English in underdeveloped areas puts forward the following relevant recommendations. China should accelerate the implementation of infrastructure construction and technology introduction in underdeveloped areas, and strengthen the training of digital literacy and media awareness for primary school English teachers. Primary schools in underdeveloped areas should use AI technology as a teaching aid to build a "double-teacher" English classroom teaching mode and a curriculum feedback platform based on this technology, to effectively promote the digital transformation of English classrooms in underdeveloped areas.