The invention discloses a system and method for calibrating electric energy error of a direct current charger. The system comprises a calibrator and a mobile communication terminal; the calibrator isembedded in a charging gun, is used for calculating the electric energy error of the direct current charger according to the acquired electric energy pulse signal for charging the electricity load andthe measured electric energy pulse signal calculated by a built-in energy meter of the direct current charger, directly sends the electric energy error to a server when the status of the current wireless communication signal is steady, and sends the electric energy error to the mobile communication terminal when the status of the current communication signal is not steady; and, the mobile communication terminal is used for receiving the electric energy error and sending the electric energy error to the server. The system provided by the invention overcomes the problem of inconvenient information transmission of the charger under a severe environment, provides more possibilities for different outdoor environments, such as the installation site of the direct current charger and so on, and is more adaptable to the requirement of the market development; and at the same time, compared with the traditional online calibrating scheme, the system provided by the technical scheme is easier to be remotely monitored.