Abstract: Current power secondary equipment management still relies on manual experience, facing challenges such as underutilized defect records, overly complex workflows, and management redundancy. There is an urgent need to introduce defect knowledge reuse and query tools for management and front-line maintenance personnel. Based on the management process of power secondary equipment, this paper sorts out the information of each stage, constructs a power secondary equipment management system based on knowledge graph, and conducts application case analysis and data evaluation.