The invention discloses a nickel-based welding rod for welding of ultralow-temperature container steel and belongs to the technical field of nickel-based welding rods. The nickel-based welding rod comprises a welding core and a coating covering the surface of the welding core. The welding core comprises the chemical components of, by weight percentage, 0-0.1% of C, 0-0.6% of Si, 1.5%-4.5% of Mn, 0-0.012% of S, 0-0.015% of P, 0-17.0% of Cr, 4.5%-9.5% of Mo, 0.5%-2.0% of Nb, 0.5%-2.0% of W, and the balance Ni. The coating comprises the powdery materials of, by weight percentage, 20%-38% of marble, 5%-8% of strontium carbonate, 1%-4% of potassium feldspar, 3%-13% of fluorite, 2%-10% of magnesium fluoride, 3%-15% of cryolite, 10%-20% of rutile, 2%-7% of ferrotitanium, 2%-6% of ferro-aluminium, 0.5%-2% of aluminum magnesium powder, 4%-7% of ferro-molybdenum, 2%-5% of ferroniobium and 1%-3% of ferrotungsten, and the sum of all the components is 100%. The nickel-based welding rod has excellent welding manufacturability in horizontal, transverse, vertical, overhead and other welding positions when an alternating current power source is adopted for welding, and the nickel-based welding rod also has excellent low temperature toughness.