The invention discloses a guardrail punching device, comprising: a base, a workbench, an electric drill, a drill bit, a mounting seat, a horizontal cylinder, a stand, a clamping device, a vertical cylinder, and a push plate, and the workbench is fixed by bolts. Above the base, the electric drill is slidably installed on the upper end surface of the workbench, the drill bit is installed on the right side of the electric drill, the mounting base is vertically fixed on the left side of the workbench, and the horizontal cylinder is installed on the mounting base On the left end face of the horizontal cylinder, the piston rod of the horizontal cylinder protrudes from the mounting seat to the right and is fixedly connected with the left end face of the electric drill. The upper and lower sides of the left end face of the seat, the vertical cylinder is installed under the right side of the base, the piston rod of the vertical cylinder extends upwards from the base and the end is affixed with a push plate. The structure of the invention has the advantages of convenience, quickness and high efficiency.