The invention belongs to the technical field of steel arch production and processing, and discloses a steel arch automatic production line. The steel arch automatic production line comprises a raw material bracket, section bar shearing equipment and an automatic double-sided welding unit, wherein a conveying chain I, a conveying chain II and a conveying chain III are fixedly mounted on the raw material bracket once; the section bar shearing equipment is fixedly arranged at the outer side of one end of the raw material bracket; the automatic double-sided welding unit comprises two automatic welding units which are separately arranged at the two sides of the other end of the raw material bracket; the section bar shearing equipment and three balance ejecting guide devices are arranged at radians; and a welding ejecting device I and a welding ejecting device II between the two automatic welding units are further fixedly arranged on the raw material bracket. The steel arch automatic production line can realize full automation of loading, section-cutting and welding of a steel arch, reduces labor intensity of a worker, improves production efficiency, and improves processing precision ofa workpiece.