The invention relates to a vehicle-mounted battery fireproof heat source management synchronization device and a use method. The device comprises a liquid storage device, a liquid storage device control valve, a fire extinguishing pipeline, a spray head or a spray hole, a fire extinguishing pipeline control valve, an inductive probe, a water inlet connecting pipe and a water outlet connecting pipe, a sealed circulating flow channel is formed among the heat exchange pipeline, the water inlet connecting pipe, a vehicle-mounted battery pack module and the water outlet connecting pipe, fire extinguishing heat exchange liquid is stored in the liquid storage device, and the liquid storage device control valve, the fire extinguishing pipeline control valve and the inductive probe are all connected with a vehicle-mounted computer controlling the heat source management system and the vehicle-mounted battery pack module and are synchronously controlled by the vehicle-mounted computer. The vehicle-mounted battery fireproof heat source management synchronization device is ingeniously combined with an existing vehicle-mounted battery heat management system; under the condition that normal operation of an existing vehicle-mounted battery thermal management system is kept, professional fire extinguishing equipment of a battery module is omitted, the integration degree of resources is improved, the structural layout of the whole vehicle is simplified, the requirement for light weight of the whole vehicle is met, cost is saved, and the working mileage of the whole vehicle is increased.