The invention relates to a wiring right and wrong detector for an electric energy metering device in the power-off state. The wiring right and wrong detector comprises a power circuit, a pulse generating circuit, an encoding and decoding circuit and an alarm circuit. The pulse generating circuit is used for transmitting a generated pulse control signal and a generated synchronous detection pulse signal to the encoding and decoding circuit and the alarm circuit respectively. The encoding and decoding circuit is used for sequentially outputting detection signals to the wiring detection input end of the electric energy metering device when the pulse control signal is triggered. The alarm circuit is used for correspondingly collecting signals of the wiring detection input end and the wiring detection output end of the electric energy metering device and conducting comparison when the synchronous detection pulse signal is triggered, judging whether the signals of the wiring detection input end and the wiring detection output end of the electric energy metering device are the same or not, giving an alarm, outputting an alarm signal to the encoding and decoding circuit and controlling the working state of the encoding and decoding circuit. According to the wiring right and wrong detector for the electric energy metering device in the power-off state, wiring of the electric energy metering device in the power-off mode or without loads can be detected.