Method and device for enhancing surface performance of double-light-spot track

The invention provides a double-light-spot track surface performance enhancing method and device, and the method comprises the steps: forming two laser light spots, including a first light spot and a second light spot, on a to-be-enhanced surface of a track; the first light spot and the second light spot are arranged in the length direction of the track to form a composite light spot; the first light spot and the second light spot are only partially overlapped, and the overlapped part forms an operation area on the surface to be enhanced; the composite light spot moves forwards on the to-be-enhanced surface in the length direction of the track for operation, the non-overlapping part located in front of the operation area forms a preheating area on the to-be-enhanced surface, and the non-overlapping part located behind the operation area forms a slow cooling area on the to-be-enhanced surface; the preheating area, the operation area and the slow cooling area of the composite light spot sequentially pass throug