In order to shorten the average response time of medium voltage distribution grid search engine system and improve the system search recall rate, a medium voltage distribution grid search engine system based on graph database is designed. The hardware part of the system is designed through searcher and interface; The system software part includes the medium voltage distribution network grid acquisition module, the graph database storage module and the grid search engine module. The medium voltage distribution network grid acquisition module collects the equipment information in the distribution network, adopts the breadth first traversal algorithm, confirms the power on status of each equipment one by one, and uses the graph data model, Through the graph database storage module, the collected equipment information is standardized, the index module is created, the electronic directory of intermediary data is established by using the relational database system, the collection objects are generated one by one according to the electronic data directory, the data files are created according to the collection objects, and the graphic index function is used to search the equipment information of medium voltage distribution network through the index module, According to the system hardware and software design, the grid search engine system design of medium voltage distribution network based on graph database is completed. Experiments show that the system has short average response time, high user satisfaction and strong robustness.