Internal control polishing of hot runner shunt plate, is an important processing process, especially the sharp knife corners, if not handled well, will lead to plastic products appear black spots, flow patterns, such as hot runner hole polishing, is an essential step in the process of hot runner, related to transparent pieces of thin-walled hot runner system success or failure. Hot runner internal hole polishing equipment, is the use of flexible fluid abrasive extrusion into the hot runner hole for the flow of polishing operations, equipment using flow mechanics, with the polymer elastic fluid grinding, with hydraulic power to allow the polymer abrasive abrasive through the surface of the workpiece to be polished, to achieve deburring polishing effect.