With the deepening reform of scientific and technological management methods, a new type of third-party scientific and technological achievement evaluation has gradually become a scale. Through the analysis of the current situation and dilemma of the evaluation of third-party scientific and technological achievements, this paper points out that the big data-assisted library can play a positive role in the authenticity, professionalism, scientificity and standardization of the third-party evaluation, and discusses the third-party evaluation-oriented evaluation methods. Contents of library information services. The purpose of this research is to explore and research new information services in which libraries are deeply involved in the evaluation of third-party scientific and technological achievements. By analyzing the problems existing in the evaluation of third-party scientific and technological achievements at this stage, the extension methods of library information services under the demand of third-party evaluation are discussed, and the development strategies of libraries for the evaluation of third-party scientific and technological achievements are put forward.