The utility model relates to an electric interface device between an electric vehicle and an AC power supply device, wherein, the electric interface device is used for electrically connecting the electric vehicle with the AC power supply device. The electric interface device comprises a power terminal, an earthing terminal, a control guiding terminal and a communication terminal, wherein, the power terminal is used for being connected with a power cable of the AC power supply device; the earthing terminal is used for being connected with the ground reliably through the AC power supply device and providing ground protection to the electric vehicle; the control guiding terminal is used for being connected with a cable with the control guiding function in the AC power supply device; and the communication terminal is used for being connected with a communication bus of a vehicle-mounted battery charger of the electric vehicle. The electric interface device between the electric vehicle and the AC power supply device ensures the charging security by technical measures such as control guiding and the like; meanwhile, the ordered charging and the ordered charging and discharging of the electric vehicle can be achieved further through the communication terminal, and the requirements of the charging security and the ordered performance of the electric vehicle can be satisfied.