The invention discloses a radial drawing device and machining method for a polyvinyl chloride (PVC)-O pipe, and belongs to the field of machining equipment for the PVC-O pipe. The radial drawing device and machining method are characterized in that a heating device, a distraction mechanism (5) used for drawing a PVC-O pipe body (7) in the radial direction and a pressing mechanism (6) used for pressing the PVC-O pipe body (7) are arranged in a machining barrel (4); the distraction mechanism (5) is installed in the machining barrel (4) in the axial direction; the pressing mechanism (6) is arranged on the machining barrel (4); the inner end of the pressing mechanism (6) penetrates through the machining barrel (4) and is near the distraction mechanism (5); the PVC-O pipe body (7) is arranged between the distraction mechanism (5) and the pressing mechanism (6) in a sleeved mode. According to the machining method, the PVC-O pipe body is arranged between the distraction mechanism and the pressing mechanism in a sleeved mode both through a pipe body drawing device and a pipe body limiting device. Through cooperation of the pressing mechanism and the distraction mechanism, the PVC-O pipe is forcedly drawn and expanded evenly in the drawing direction of the distraction mechanism. The overall uniformity of radial drawing of the pipe body is guaranteed effectively. The use strength of the pipe is also guaranteed.