The invention discloses a fault diagnosis method and system for an intelligent electric meter, and an electronic device. The method comprises the following steps: S1, acquiring data; S2, extracting characteristic factors, establishing a fault label, and forming a fault portrait; S3, building a fault sensing model, and outputting a fault sensing result; and S4, comparing with a fault model libraryto complete fault cause positioning, suggestion processing or help guidance. The system comprises an intelligent diagnosis support center, an acquisition processing module, a fault sensing module, a fault diagnosis module and an operation and maintenance learning module. Based on operation and maintenance, environment, fault analysis, verification and detection, acquisition and other information,big data analysis and artificial intelligence technologies are utilized to carry out acquisition fault intelligent diagnosis model research, and the operation process guidance problems of accurate research and judgment of acquisition faults, qualitative analysis of equipment faults and field fault processing are solved.