The invention provides an automobile plate spring width double side edge milling production line and a production process. The automobile plate spring width double side edge milling production line comprises an automatic feeding stacking device, a material inlet roller way, a feeding material transferring machine, a material supporting roller way, a centering device, a plate spring chip discharging machine, an edge milling machine, a servo positioning device, a discharging material transferring machine, a discharging roller way and an automatic discharging stacking device. A first feeding horizontal moving device arranged on the automatic feeding stacking device is installed on a first feeding fixing support, a feeding stacking electromagnetic sucker is installed on the first feeding horizontal moving device, a feeding roller way is arranged at the lower middle position of the first feeding horizontal moving device, a feeding frame used for carrying plate springs is arranged on one side of the feeding roller way, and the material inlet roller way is arranged on the side face of the feeding roller way. Different installation manners are adopted in designed milling tool seats, a single plate spring can be milled by milling cutters, and multiple plate springs can be stacked to be milled by the milling cutters at the same time; the plate springs can be positioned accurately in thelength direction and the width direction due to a rear blocking device, the servo positioning device and the centering device which are designated, the precision of machined finished products is high,and the product qualification rate is increased.