Power grid interaction type electric automobile intelligent charging device

The invention discloses a power grid interaction type electric automobile intelligent charging device, comprising charging piles, a power grid interaction device and a power distribution cabinet; the power grid interaction device is arranged in the power distribution cabinet; all the charging piles which are powered by the same one power distribution cabinet are connected to the power distribution cabinet through a three-phase power supply wire in a wiring slot; all the charging piles are in communication with the power grid interaction device through GPRS; the power grid interaction device determines a whole pile power need of each charging pile according to the whole pile operation states of all the charging piles, a charging need of a user, a charging need of an electric automobile and usage condition information of a charging pile inner power supply; a supply and demand ratio is obtained through dividing a power grid capacity by total power need of the power distribution cabinet; and maximum available pow