With the rapid development of computer technology in modern society, it has had a large and small impact on all aspects of our lives. Among them, the one million enrollment policy has a great impact on the future development path of higher vocational colleges, and the teaching management mode of higher vocational colleges based on the one million enrollment policy has also undergone great changes with this policy. In this situation, the teaching management mode of higher vocational colleges has major challenges and rare opportunities. In meeting these challenges and opportunities, higher vocational colleges should use computer technology management methods and innovations derived from computer technology. The method is applied well. This article is based on some problems such as poor student base, insufficient teaching staff and old management methods faced by higher vocational colleges after the expansion of one million enrollment, and through the calculus algorithm in computer technology, it is based on computer technology. A series of research and discussion were conducted on the teaching management mode of the school after the enrollment expansion of one million. The enrollment expansion by one million in higher vocational colleges is of great significance for promoting the reform of personnel training policies, deepening the reform of the teaching management mode of higher vocational colleges, expanding the growth and development space of students, and alleviating the employment pressure of students. In the context of the expansion of enrollment based on one million in higher vocational colleges, such a large-scale increase poses new challenges to the faculty of higher vocational colleges, and the diversity of needs also poses new challenges to the teaching management mode of work, so many people The resulting complexity also poses new challenges to teaching management. To deal with these challenges, higher vocational colleges should deepen teaching reform, explore new ways to combine education and training; strengthen the construction of the teaching team; and innovate teaching management work models. The experimental results show that after the enrollment of higher vocational colleges under the computer technology is expanded by one million, the teaching management mode of higher vocational colleges should change.