Aiming at the problem that the electricity meter in the metering cabinet can not be found in time when the measurement inaccuracy occurs in the long-term operation process, a method for monitoring the measurement inaccuracy of the electricity meter based on the intelligent measuring switch is proposed. The common causes of inaccurate measurement of electricity meter are analyzed. The method of judging the inaccurate measurement of electric energy based on intelligent measuring switch is designed, and the on-line monitoring process of inaccurate measurement is constructed. The effectiveness and feasibility of the proposed method are verified by real experiments. This method can predict the measurement abnormality of the electricity meter in advance and provide technical support for the management of the electric energy metering cabinet.