The invention relates to the technical field of welding materials, in particular to an electric arc welding rod for ultralow-temperature high manganese steel. The welding rod comprises a welding rod steel core and a coating wrapping the welding rod steel core, wherein the welding rod steel core comprises, by weight, 0.35%-0.46% of C, 0.06%-0.18% of Si, 22%-30% of Mn, 3.7%-4.6% of Cr, 1.8%-2.5% of Ni, 1.3%-2.1% of Mo, smaller than or equal to 0.015% of S, smaller than or equal to 0.015% of P and the balance Fe and inevitable impurities, water glass serves as a binding agent, the coating accounts for 35%-40% of the total weight of the welding rod, existing welding rod production equipment and an existing welding rod production method are adopted for preparation; the coating comprises, by mass, 20%-30% of marble, 5%-10% of strontium carbonate, 18%-25% of fluorite, 3%-6% of zircon sand, 4%-8% of rutile, 3%-5% of ferrotitanium, 3%-8% of magnetite, 4%-8% of manganese metal, 4%-6% of chromium metal, 6%-10% of nickel metal, 2%-4% of molybdenum metal, 2%-3% of copper powder, 1%-3% of ferrovanadium, 4%-7% of nitrided ferrochromium, 0.5%-1% of graphite, 0.3%-1% of sodium carbonate, and 0.3-1% of seaweed. The welding rod has good ultralow-temperature impact toughness, excellent welding process performance and excellent all-position welding operation performance.