The present invention discloses a multi-standard compatible electrical vehicle charger, including a power converter having an interface compatible with messages or instructions of an internal protocol; when the electrical vehicle charger charges an electric vehicle, the power converter is adapted to output power to a battery of the electric vehicle; and a data transmission device having an internal interface compatible with messages or instructions of the internal protocol and an external interface compatible with messages or instructions of an external protocol; wherein when the electrical vehicle charger charges the electric vehicle, the data transmission device is adapted to communicate with a battery management system through the external interface according to the external protocol followed by the battery management system, and to communicate with the power converter through the internal interface according to the internal protocol followed by the power converter. This electrical vehicle charger improves the utilization rate of the electrical vehicle charger.