A punch device includes a mounting platform, a punch mechanism, a feeding mechanism, and a positioning and ejecting mechanism. The punch mechanism is mounted over the mounting platform for punching a pre-punched workpiece positioned on the mounting platform. The feeding mechanism is mounted on the mounting platform for conveying the pre-punched workpiece. The positioning and ejecting mechanism is mounted on the mounting platform and positioned under the punch mechanism, for positioning the pre-punched workpiece during a punching process, and ejecting the punched workpiece after the punching process is performed, thereby facilitating an operator to take away the punched workpiece.