A welding method for butt welding for a ship is provided to improve welding performance by using the composite wire mixed with admixture as a welding wire and by using the cut wire-type welding filler. A welding method for butt welding for a ship comprises a step of placing base metals(21) to be faced with a 0~3mm gap; a step(S110) of attaching a backing material(220) to seal the gap of the base metals; a step(S120) of filling a cut wire-type welding filler(23) and a welding flux between the base metals; and a step(S150) of welding the whole or part thickness of the base metal and finishing the welding by using the composite wire whose diameter is 3.2~4.8mm for the submerged arc welding.
