The invention relates to a paint spray waste gas treatment integrated device and a process thereof, belonging to the technical field of environment protection. The bottoms of spray towers are connected with a ventilation device of a paint spray workshop through guide air tubes, the two spray towers are connected with corresponding circulating water tanks through a circulating water pump, the circulating water tanks are internally provided with water tank detection devices, the tops of the spray towers are provided with output ducts, the output ducts are provided with intelligent detectors, tail ends of the output ducts are connected with a centrifugal fan, and the other end of the centrifugal fan is connected with a fog filter. The paint spray waste gas treatment integrated device has a reasonable structure design, has a simple process, is convenient to operate, is highly flexible, has high stability and a high waste gas treatment effect, is low in running cost, can treat waste gas of different paint spray workshops at the same time and has high efficiency; and the treatment device is low in cost, has a high use ratio, and can achieve a better environment protection effect.