As an effective educational concept and learning method, in-depth learning is very important to promote human development. As an important trend in the development of higher education, blended teaching provides a broad space for students' in-depth learning. This paper theoretically realizes the transformation from "teacher-centered" to "student-centered", understands the learners' learning investment, helps Chinese medical students to invest more actively and efficiently in blended public English learning, and enriches the theoretical research of college Students' English learning investment. Through the analysis of the implementation effect, it is found that the blended teaching mode of promoting in-depth learning can improve students' learning results and improve students' understanding of knowledge. Blended teaching mode can stimulate students' in-depth learning motivation and learning investment, promote students' application of in-depth learning strategies, and achieve the purpose of promoting students' in-depth learning.