In this paper, based on the principle of electromagnetic interference on some key parts of the smart meter, power frequency electromagnetic field as the interference sources, using finite element software ANSYS electromagnetic analysis function intelligent watt-hour meter factory frequency magnetic field interference power transformer, voltage transformer and current transformer are analyzed and studied. Based on finite element analysis, finite element analysis model is established, and calculation, comparison and analysis on the model, according to the result of finite element calculation and analysis results puts forward some measures for preventing electromagnetic interference of smart meters.