The present invention relates to a monitoring system, and discloses a standard measurement unit and method used for an electric energy metering remote on-line monitoring system. The standard measurement unit used for the electric energy metering remote on-line monitoring system comprises a current input card, a voltage input card, a load sampling card, an error calculating card and a motherboard, and the current input card, the voltage input card, the load sampling card and the error calculating card are all connected with the motherboard to transmit the signals mutually. The measurement signals are inputted from the current input card, the voltage input card, the load sampling card and the error calculating card separately and are processed, and then a standard electric energy pulse signal is outputted via the motherboard. According to the present invention, by adopting a secondary loop measurement method and a pulse comparison method, and by the error calculating card, various functions, such as the standard measurement, the error calculation, the offline setting, the system calibration, etc., are realized, so that the monitoring system possesses a stronger anti-interference capability and a higher reliability, and the measurement precision of the monitoring system is also improved substantially.