CNC machining center is a kind of CNC machining machine tool with more complete functions. It has the functions of milling, boring, drilling, tapping and cutting on one equipment, so that it has a variety of technological means. The machining center is provided with a knife library, which stores various kinds of tools or checking tools in different quantities, which are automatically selected and replaced by the program in the process of processing. This is the main difference between CNC milling machine and CNC boring machine. Especially for the necessary use of tooling and special aircraft equipment to ensure product quality and efficiency of the workpiece. This will save a lot of time and cost for the development and upgrading of new products, so that enterprises have stronger competitiveness.