Automatic feeding and discharging steel pipe threading machine

The utility model belongs to the technical field of pipe machining equipment, and particularly relates to an automatic feeding and discharging steel pipe threading machine. Comprising a threading machine, a steel pipe conveying line, a movable chuck and two movable clamping blocks. A steel pipe feeding frame is arranged between the steel pipe conveying line and a clamp of the threading machine, and a steel pipe track changing device is arranged on the butt joint section of the steel pipe conveying line and the steel pipe feeding frame. The steel pipe feeding frame comprises two rail frames capable of sliding oppositely to adapt to the length of a steel pipe, an upper clamping plate and a lower clamping plate of each rail frame are installed on a vertical plate on the outer side, the distance between the upper clamping plate and the lower clamping plate can be proportionally adjusted to form a rail matched with the outer diameter of the steel pipe, and the rail tends to go down a slope from a steel pipe convey