The core literacy of student development is an important content of promoting education reform and has an important effect on adapting the strategy of developing English talents in the future in our country. The cultivation of English core literacy depends on the innovation of teaching methods, the improvement of teachers' professional ability and the application of information technology, which is integrated into the training of listening, speaking, reading and writing skills. At present, the emphasis of English teaching is mainly placed on reading and writing, ignoring the cultivation of students' oral English, and students' awareness of oral communication is very weak, which is not conducive to the comprehensive development of students' core English literacy. English teachers should start from the concept of core literacy, develop targeted oral learning strategies for students, broaden the learning channels for students, and promote the improvement of students' oral English ability. This paper analyzes the present situation of oral English teaching and discusses the strategies to improve the oral English of secondary vocational students under the concept of core literacy.