The invention relates to laser welding equipment, in particular to a laser welding protective nozzle capable of protecting welding seams to improve welding quality, which comprises a cavity board, a bottom board connected with the underside of the cavity board, wherein both the cavity board and the bottom board are provided with a laser through hole; inner and outer two mutually independent cavities are arranged on the periphery of the laser through hole of the cavity board respectively; two groups of air holes communicated with two cavities respectively are correspondingly arranged on the periphery of the laser through hole of the bottom board; and two groups of air ducts are arranged above the cavity board, one group of air ducts are communicated with one group of air holes on the bottomplate through one cavity, and the other group of air ducts are communicated with the other air holes on the bottom board through the other cavity. The protective nozzle has the advantages that: a dual-air-path design allows one nozzle to spray two protective gases at the same time; as the air paths, air cavities and an air outlet in the nozzle are reasonably designed, the air exhaust is even andcan effectively protect straight welding seams and curved welding seams; and the protective gases are saved and welding cost is reduced on the premise of ensuring protection effect.