The invention provides a vehicle brazing method and a vehicle brazing device. The brazing device comprises a brazing heat source, a brazing torch, a wire feeder, a robot and a controller. The brazing torch is arranged on the robot, and the controller is connected with the brazing heat source, the brazing torch, the wire feeder and the robot respectively and controls the same to operate. The brazing heat source comprises a front-end plasma power supply and a rear-end plasma power supply. A front-end plasma nozzle, a rear-end plasma nozzle and a wire guiding nozzle are arranged in the top of the brazing torch, the front-end plasma nozzle is connected with the front-end plasma power supply through a cable, the rear-end plasma nozzle is connected with the rear-end plasma power supply through another cable, the wire guiding nozzle is connected with the wire feeder, and a brazing wire discharged from the wire feeder extends out of the wire guiding nozzle. The vehicle brazing device has the advantages of high seam strength, narrow seams, freeness of spattering, high brazing efficiency and the like; compared to laser brazing manufacturing, brazing manufacturing can greatly lower investment, use cost can be lowered, and wide application can be achieved.