This design starts from the reliability of the machining center, conducts in-depth research and comparison on the performance of various tool magazines, and makes a reasonable tool magazine design for the horizontal NC machining center. The tool magazine adopts a chain structure, which is composed of a tool magazine body, a tool magazine base, a tool magazine drive device, a tool sleeve chain orientation device, a tool sleeve chain, and a manual tool unloading device. The capacity of the tool magazine is 60 knives, and the tool selection mode is optional.