The present invention provides an electric energy meter calibration device and a usage method thereof. The electric energy meter calibration device comprises a box body and a box cover, an electric energy meter on-site calibration instrument and a standby electric energy meter are arranged inside the box body, and plugs are arranged between the wiring ends of the electric energy meter on-site calibration instrument and the wiring ends of the standby electric energy meter. Each wiring end of the electric energy meter on-site calibration instrument corresponds to one plug, and each wiring end of the standby electric energy meter corresponds to one plug. The plugs comprise the calibration instrument wafers and the electric energy meter wafers, the calibration instrument wafers are connected with the wiring ends of the electric energy meter on-site calibration instrument, and the electric energy meter wafers are connected with the wiring ends of the standby electric energy meter. Insulators and switches are arranged between the calibration instrument wafers and the electric energy meter wafers, the plugs are equipped with a socket cooperatively, and the socket is equipped with the first elastic wafers and the second elastic wafers. By adopting the above technical scheme, and according to the present invention, the electric energy meters can be calibrated on sites on the condition of not stopping the power supply, and the power consumption of the users is not influenced.