The invention discloses an intelligent electric energy meter clock cell fault diagnosis method. The intelligent electric energy meter clock cell fault diagnosis method includes the steps: combining fault mode influence analysis with fault tree analysis, after performing FMEA analysis on the intelligent electric energy meter fault, establishing a fault mode FMEA analytical table, combining with theFMEA analytical table, establishing a complete fault tree model, and performing FTA analysis on the clock cell fault to obtain the result of qualitative and quantitative analysis. The intelligent electric energy meter clock cell fault diagnosis method can quickly find out the fault mode causing occurrence of under-voltage of the cell and the reason for occurrence of the fault so as to greatly reduce blindness and complexity of fault diagnosis and improve the fault diagnosis speed and accuracy, thus being convenient for fault diagnosis management and targeted control during the application process, when the liquid crystal screen of the intelligent electric energy meter displays the content "err-04" or an alarm prompt about under-voltage of the cell.