To process with this machine it is not necessary to beat flat the bevel edge. The machine with 380V power, which can realize at-one-time moulding and automatic material return, can hot roll 10×50mm or less flat iron, 16×16mm or less square steel, as well as φ16mm or less steel bar end into distinct veining fishtail shape, which is usually called as "fishtail", and this belongs to advanced decorative processing before metal pattern bending. The machine can be used to roll coarse fishtail and thin fishtail.