In order to improve the work efficiency of the power grid group reconciliation system and optimize the service effect of the power grid group, a term frequency-inverse document frequency (TF-IDF) optimization algorithm is designed. This paper discusses the basic design of the power grid group reconciliation system, discusses the TF-IDF algorithm optimization design method under the B/S (browser/server) architecture, and analyzes the comprehensive application effect of the TF-IDF algorithm optimization design in the power grid system under the B/S architecture. The results show that the reconciliation effect of the algorithm is significantly improved, which provides a technical basis for optimizing the power grid reconciliation system and contributes to improving the service quality of the power grid group.