The invention discloses an electric energy metering method and system based on error self-diagnosis. The method comprises the steps of: obtaining a current loop self-diagnosis signal through the collection of a current sampling loop, and obtaining a voltage loop self-diagnosis signal through the collection of a voltage sampling loop; performing calculation according to the current loop self-diagnosis signal, the voltage loop self-diagnosis signal and a pre-loaded metering calibration parameter in accordance with a preset rule to obtain a self-diagnosis pulse; starting a backup clock, and measuring the frequency of the self-diagnosis pulse; comparing the frequency of the self-diagnosis pulse with a pre-stored self-diagnosis pulse frequency standard value to judge whether the frequency of the self-diagnosis pulse meets a preset standard; if the frequency of the self-diagnosis pulse meets the preset standard, automatically starting the next diagnosis; and if the frequency of the self-diagnosis pulse does not meet the preset standard, reporting a fault according to a comparison result. According to the method and system, by adding a self-diagnosis function of calibration parameter, automatic detection is realized, and related software fault is alarmed, so that the calibration parameter can be effectively managed and controlled, and the problem of the electric energy integration clock fault detection is solved at the same time.