Abstract: Under the background of constructing Double First-rate universities, university library, as a vital public space of the university, is not only the main means of serving students, but also an indispensable platform for educating. Therefore, it is necessary to evaluate its work. Compared with other evaluation models, the third-party evaluation is more independent, objective and fair, and its evaluation results can objectively reflect the indicators of the university library. At present, the third-party evaluation of university libraries has significantly developed, and the qualifications, evaluation indicators and institutional arrangements of the third-party agencies are all important factors in the assessment activities.