Hole shrinkage roll-rounding device for port of stainless steel pipe

The utility model discloses a hole shrinkage roll-rounding device for a port of a stainless steel pipe. The device consists of a lathe bed, a workpiece baffling mechanism, a workpiece positioning mechanism, a rolling wheel propulsion mechanism, a rolling wheel transmission mechanism, a rolling wheel transportation mechanism and a programmable logic controller (PLC), wherein workpieces which are fed onto a roller surface between a left roller and a right roller in a carrier roller bracket (1) and are fed into a workpiece rolling position are positioned and baffled by the workpiece positioning mechanism and the workpiece baffling mechanism; and the rolling wheel transmission mechanism (23) is transported to the workpiece rolling position through the rolling wheel transportation mechanism, the upper and lower rolling wheels (23-3) are driven to enter the workpiece rolling position and press a workpiece rolling part through upper and lower propulsion nuts (23-10) which are in threaded connection with a propulsion