The invention discloses an automatic welding method for a gas delivery pipe support. The automatic welding method comprises the steps of: a, conducting preparation before welding; b, mounting a gas delivery pipe; c, carrying out preliminary welding; and d, performing secondary welding. By mounting a support on a support installation plate, and fixing the gas delivery pipe to a turnover clamping arm of a clamping table, after a clamping table drives the turnover clamping arm to drive the gas delivery pipe to descend, the upper portion of the connecting position of the gas delivery pipe and the support is welded by a welding gun, then the clamping table drives the gas delivery pipe provided with the support to ascend, the turnover clamping arm drives the gas delivery pipe to turn over, after turning over is completed, the clamping table controls the gas delivery pipe to descend, the welding gun operates again, and the lower portion of the connecting position of the gas delivery pipe and the support is welded, so that connection between the gas delivery pipe and the support is completed, the phenomena of insufficient welding and welding leakage are avoided, the welding efficiency is improved, and meanwhile, manual butt joint operation is avoided; therefore, the welding precision is improved, the welding efficiency is greatly improved, and resources and manpower are saved.