This flange machine has the characteristics of time-saving, material saving, high work efficiency, good sealing, sturdy and durable, and strong connection. It is especially suitable for ducts with a large cross-section of ventilation ducts. The machine is mainly composed of a feeding frame, a cold rolling forming main body, and a cutting part. It is equipped with a high-speed steel circular saw blade non-stop cutting system. It can be cut to length. The burr is small and can be fully automated. Its working speed is 6 meters/minute. According to its working performance and flange strength and sealing grade, it can be divided into five types: t-20, t-25, t-30, t-35, t-40, and the corresponding connection angle model is t-20dc, t- 25dc, t-30dc, t-30dc, and t-40dc.