The invention discloses a coated
welding wire for
welding low-
alloy high-strength steel. The coated
welding wire comprises a welding wire substrate and a
coating which coats the surface of the welding wire substrate, wherein the welding wire substrate is made from the following components in percentage by weight: 0.029 to 0.041 percent of Ti, 0.01 to 0.015 percent of Al, 0.083 to 0.11 percent of Nb, 0.1 to 0.15 percent of C, 0.2 to 0.3 percent of Cr, 0.3 to 0.5 percent of Si, 0.01 to 0.03 percent of N, 1.4 to 1.7 percent of Ni, 0.1 to 0.6 percent of Mo, less than or equal to 0.002 percent of P, less than or equal to 0.002 percent of S, and the balance of iron and unavoidable impurities, wherein as specified by the following formula, K is between 0.013 and 0.032, K=29[Ti]+52[Al]+27[Nb]-100[N]; [Al], [Ti], [Nb] and [N] represent the weight percentage contents of Al, Ti, Nb and N in the welding wire substrate respectively. The invention further discloses a manufacturing method of the coated welding wire for welding the low-
alloy high-strength steel. By adopting the coated welding wire, high strength of welding
metal is ensured, the welding performance of the low-
alloy high-strength welding wire is improved finitely, the occurrence of cold cracks is controlled, a low splashing rate is achieved, and the welding requirement of the high-strength low-
alloy steel is met.