Disclosed is a metal piece machining method. The metal piece machining method includes the following steps that a machine tool is provided, and comprises a working table, a turning tool feeder and a scraper feeder which mutually cooperate, the turning tool feeder comprises a turning tool, and the scraper feeder comprises a scraper; a workpiece is positioned on the working table; the working table drives the workpiece to rotate; the turning tool feeder controls and feeds the turning tool in a high-speed and reciprocating mode to the workpiece so as to achieve circumferential machining on the rotating workpiece; the turning tool feeder performs translation relative to the working table so as to perform turning machining on the top of the workpiece; the working table stops rotating; the scraper feeder drives the scraper to move around the edges of the workpiece so as to perform high-speed scraping on the edges of the workpiece. The metal piece machining method is high in machining efficiency and surface smoothness of the machined workpiece.