The invention relates to a production technology for an automatic low alloy steel welding wire for a ship, wherein preheating and copper plating are not needed. The production technology is characterized in that the welding wire comprises 0.02-0.1% of C, 2-4% of Mn, 2-4% of Ni, 0.5-1% of Mo, 0.5-0.8% of Si, 0-0.5% of Cu, 0-1.2% of Cr, 0-0.12% of V and 0-0.05% of Ti. The production technology comprises the steps of vacuum melting, forging, steel rolling, wire rod hot rolling, mechanical dust removal, chlorohydric acid pickling, neutral water washing, high-pressure water cleaning, alkali neutralization, boronizing, saponification with liquid soap, drying, primary cold drawing, recrystallization annealing, chlorohydric acid pickling, neutral water washing, high-pressure water cleaning, alkali neutralization, boronizing, saponification with liquid soap, drying, secondary cold drawing, chlorohydric acid pickling, neutral water washing, high-pressure water cleaning, alkali neutralization, saponification with liquid soap, brilliant polishing and drawing and rust-proof liquid coating.