The invention provides a device for automatically fighting a fire of electric vehicle battery through intelligent monitoring. The device comprises a battery box, a power mechanism, a plurality of firefighting mechanisms, a temperature sensor, a smoke transducer and a controller, wherein the power mechanism comprises a first driving wheel, a second driving wheel, a driving belt, a driving mechanism and a plurality of gears; an internal gear ring arranged around the driving belt annularly is arranged at the periphery of the driving belt and at the top end of the battery box; the gears are arranged between the internal gear ring and the driving belt, and are engaged with the internal gear ring and the driving belt; the fire fighting mechanisms are separately connected with the gears; the temperature sensor is used for detecting the temperature in the battery box; the smoke transducer is used for detecting the smoke concentration in the battery box; and the controller is connected with the temperature sensor, a driving mechanism and the fire fighting mechanisms. The device adopts best structural design, can be matched with all electric vehicles in the markets, and has the characteristics of being rapid in response, elegant in appearance, high safety factor and the like.