With the continuous upgrading and further development of higher education, the competition among colleges and universities is becoming more and more fierce, and the construction of first-class disciplines is the core means to improve the level of colleges and universities and is also the key task of long-term development of colleges and universities. As a college resources center, library is the reserve guarantee of the construction of first-class discipline. According to the role of college library in the construction of first-class discipline, this paper analyzes the linkage relationship between the library and the construction of first-class discipline in colleges and universities, and points out the service means of the university library on first-class discipline construction, which can provide reference on the planning, construction and transformation of college library.