Nickel-based welding rod capable of resisting reddening and cracking of coating

The invention belongs to the field of welding materials, in particular to a nickel-based welding rod capable of resisting reddening and cracking of a coating. The nickel-based welding rod comprises anickel-based core wire, a nano graphene coating I, a nano graphene coating II and a coating, wherein the nickel-based core wire is provided with a longitudinally penetrating V-shaped groove on the outer circumferential surface, a round hole is formed in the center of the nickel-based core wire and a longitudinally penetrating V-shaped groove is formed in the inner wall of the round hole. The nickel-based core wire is prepared from the following components in percent by mass: 18-22% of chromium, 6.2-8.0% of manganese, 2.2-3.6% of molybdenum, 3.2-4.5% of niobium, 2-3.5% of iron, 0.9-1.2% of silicon, 0.6-0.8% of titanium, 1.5-2% of lanthanum oxide, less than or equal to 0.005% of carbon and the balance nickel. The core wire which is heated is small in volume expansion, quick to dissipate heatand high in ability of re