[Objective] This research establishes an assessment mechanism for digital library’s micro-services from the perspectives of user, information and technology. It provides the theoretical foundation and criteria for us to improve the micro-services. [Methods] First, we proposed a Group AHP method based on clustering technique to construct a judgment matrix to evaluate the target system. Second, conducted an empirical analysis of 10 representative digital libraries from China and abroad with the fuzzy membership degree function. [Results] The proposed mechanism was practical and could help us improve the micro-services of digital libraries. [Limitations] The assessment criteria should be further examined under the specific circumstances facing the digital libraries. The sample size of the empirical analysis is small, thus, the conclusion might be limited and subjective. [Conclusions] This paper provides new research perspectives for the digital library micro-services, as well as methods to improve their quality and efficiency.