Circular pipe automatic cutting machine

The invention discloses a circular pipe automatic cutting machine which comprises a rack, a workpiece bearing mechanism arranged on the rack, a host transmission system arranged at one end of the workpiece bearing mechanism, an automatic pipe inlet system arranged at the other end of the workpiece bearing mechanism and a knife holder control device arranged on the workpiece bearing mechanism; oneend of the workpiece bearing mechanism is further provided with an electric cabinet; the electric cabinet is arranged below the host transmission system; and the host transmission system can drive theworkpiece bearing mechanism to rotate. The circular pipe automatic cutting machine is reasonable in structure layout, simple in mounting and operation and convenient and practical in processing, realizes cutting automatic pipe inlet, weakens the operation intensity, reduces the cutting period time, improves the efficiency, reduces material waste and ensures the quality of a part due to accurate size of the cut part and th