Two-way machining method of polymer pipe bar

The invention relates to a two-way machining method of a polymer pipe bar. The method comprises the following steps that the pipe bar is pushed into a main shaft mechanism by using an automatic feeder, and the front end of the pipe bar in the main shaft mechanism is machined by using a movable machining mechanism; and after the front end of the pipe bar is machined, an auxiliary shaft mechanism isused for clamping the front end of the pipe bar, the movable machining mechanism is used for cutting off the rear end of the bar, then the auxiliary shaft mechanism is used for moving the pipe bar toa fixed machining mechanism, the rear end of the pipe bar in the auxiliary shaft mechanism is machined, and therefore two-way machining of the pipe bar is completed. According to the method, accuratecutting can be conducted according to the lengths of insulation sleeves of spark plugs of different types, waste of blank materials of a single product is greatly reduced, meanwhile, automatic turning-around connection machini