The invention provides an insulation resistance measurement rod capable of automatically searching iron caps. The rod comprises an insulation rod, two copper electrodes, wires, extension soft wires and magnets and is characterized in that the copper electrodes are connected with the extension soft wires; the other ends of the extension soft wires are connected with the magnets; and by arranging the magnets enclosed to the two electrodes between to-be-measured insulators and shaking the magnets, the magnets will be absorbed to iron caps of the insulators. The beneficial effects are that insulator iron cores can be automatically searched and contacted, so time and labor are saved; and the measurement rod is easy to operate and simple to adjust, so measurement speed is accelerated and working efficiency is improved.