According to the characteristics of numerical control (NC) turret punch press and the actual production on site, the application of help manipulator for loading/unloading of the sheet metal material in NC turret punch press was analyzed, and the sheet metal grab structure, help manipulator, NC turret punch press composition blocks were constructed, and the mechanical body whole mechanism of open buttress feeding machine was designed. The key technology of finite element analysis (FEA) and kinematical analysis were introduced. 