Provided is a sheet metal automatic punching machine. The sheet metal automatic punching machine comprises a vibration conveying device and a punching device. The vibration conveying device comprises a vibration mechanism and a vibration conveying disc. The vibration conveying disc comprises a material storing cavity, a sorting and conveying mechanism arranged above the material storing cavity and a screw conveying rail which is used for connecting the material storing cavity and the sorting and conveying mechanism. The sorting and conveying mechanism comprises orientation sorting segments, front and back side sorting segments and a stacking and sorting segment, wherein the orientation sorting segments, the front and back side sorting segments and the stacking and sorting segment are sequentially connected. According to the sheet metal automatic punching machine, the automatic material feeding on a sheet metal can be achieved by utilizing vibration conveying of the vibration conveying disc and matching with sorting on the orientation and the front and back side of the sheet metal carried out by each sorting segment.