Laser welding method capable of eliminating hot rolling delta-TRIP steel weld cracks

The invention discloses a laser welding method capable of eliminating hot rolling delta-TRIP steel weld cracks. The laser welding method comprises the steps of splicing a tape head of a to-be-welded steel coil without pickling with a tape tail of the other steel coil; preheating the spliced seam; carrying out conventional laser welding on the spliced seam; heating the laser welding seam in a heating section of an annealing furnace; carrying out annealing in an annealing section of the annealing furnace; and performing normal post-process of the steel sheet. According to the laser welding method, a laser welding machine can not only perform the characteristics of laser welding, but also prevent crack spreading or even fracture on the laser welding joint, and the welding efficiency and the welding qualification rate can be obviously improved. During welding, the problems of low welding line energy of preheating and post-heating caused by high welding speed in the prior art are avoided, so that the welding speed