A wiring board punching marking tool for a power grid includes a cross framework and four positioning marking components, wherein the cross framework includes a left arm, a right arm, a front arm and a rear arm; the four positioning marking components are mounted on the four arms respectively. The tool has the benefits that the centers of all mounting holes can be confirmed as per positions of the mounting holes in equipment, then the positioning marking components of the punching marking tool are fixed on all the arms of the cross framework, then the punching marking tool is placed on a wiring board, the positioning marking components are beat through a rawhide hammer, so that the center position of a punched hole in the wiring board can be obtained, and position reference points of four holes forming a square when the four hole centers are connected can be obtained through one-time positioned fixing and marking, obtained shapes and position precision of the four holes can be finally guaranteed, the probability of one-time qualified marking for the hole distance of the wiring board can be improved, waste of metal materials can be reduced, and the construction efficiency of secondary construction can be improved.