The invention discloses a bent-torsional component welding method. The method comprises the following steps: a guide wheel is additionally mounted on one side of a submerged arc welding car, and the submerged arc welding car added with the guide wheel is in spot welding connection with a magnetic sucking car; the bottoming and the filling welding are performed on bent-torsional components by using first preset welding parameters; and the submerged arc welding car and the magnetic sucking car in spot welding connection are used for performing the cover surface welding on the bent-torsional components after the bottoming and the filling welding, so that the welding efficiency is improved, and the appearance molding of cover surface welding lines is guaranteed.