This method of submerged arc welding includes: a machining step of machining a double V groove; and a welding step of performing a one-run welding with a flux. In the welding step, a welding current for a first electrode is an alternating current with a waveform ratio of 60% or greater and 90% or less, and welding currents for the other electrodes are an alternating current with a waveform ratio of 70% or greater, or a negative direct current. The flux includes, in a mass ratio to a total mass of the flux, 10% to 50% of Al 2 O 3 : and 16% to 30% of SiO 2 , and further includes: one or more of MgO, TiO 2 , CaF 2 , and MnO, a total of which is 10% to 60%, the MgO, TiO 2 CaF 2 , and MnO being limited to not more than 40%, 20%, 30%, and 20%, respectively.
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