The invention discloses a wind power equipment fault diagnosis method and system. According to the invention, related data of wind power equipment is comprehensively collected, a data warehouse is built, the data integrity is ensured, a data basis is provided for data mining, fault data is extracted from historical data of the data warehouse, the fault data is converted and loaded to the data warehouse so as to build a multi-dimensional data model and a fault fact table, preliminary analysis is performed on the data by adopting clustering analysis, data correlation analysis is performed by integrating various types of data, comparative judgment is performed, integration of multiple intelligent criteria is formed, and wind power fault diagnosis example explanation is performed according to the intelligent criteria. The wind power equipment fault diagnosis method has the advantages of complete criterion, advanced method and accurate judgment, provides a new method for power equipment fault judgment, overcomes defects and disadvantages of a single method and improves the accuracy of fan equipment fault diagnosis.