The invention discloses a welding process for double-side formation with one-side welding. The welding process comprises the steps of a, workpiece surface cleaning; b, welding material selecting and welding process parameter setting; c, welding wire drying, wherein, a welding wire is dried, and the welding wire is kept clean and smooth; d, copper base plate installation, wherein, a submerged arc welding machine is adopted for welding, and a copper base plate is installed on the submerged arc welding machine; e, workpiece placing, wherein, the workpiece is horizontally placed on the lower sideof the submerged arc welding machine, and the center of the longitudinal welding seam of the workpiece is enabled to be kept consistent with the center of the copper base plate; f, run-on plate and run-off plate placing, wherein, a run-on plate and a run-off plate are correspondingly placed on the two ends of the longitudinal welding seam of the workpiece; and g, positioned welding, wherein, fullweld is carried out on the two ends of a workpiece, wherein the length of the workpiece is 100mm, spot welding is carried out, the length is 100mm, spot welding is carried out every 200mm-300 mm, andthe length of spot welding is 30mm-50mm. The welding process has the advantages that a bevelling step is omitted, time and labor are saved, the welding efficiency is improved, and the welding qualityis improved.