Longitudinal weld steel armored cable and forming method thereof

The invention discloses a longitudinal weld steel armored cable and a forming method thereof. The method comprises the following steps: firstly, sequentially winding and coating a polytetrafluoroethylene film layer and a glass wool cloth tape layer on the outer surface of a conductive core wire to form a cable core wire; then, when the cable core wire is straightened and extends forwards, the long-strip-shaped first strip steel is synchronously and longitudinally straightened and extends into the position below the cable core wire, the first strip steel is transversely and upwards bent into a barrel shape from the two sides below the cable core wire, and the cable core wire is wrapped in the first strip steel while the first strip steel is bent; the first strip steel forms a steel armor sheath wrapping the cable core wire, and a longitudinal seam is formed at the top of the steel armor sheath; and finally, welding and sealing longitudinal joints, and sequentially carrying out grinding, polishing, drawing and