Provided is an insulation resistance measurement rod capable of automatically searching iron caps in all directions. The measurement rod comprises an insulation rod, two bar-shaped metal electrodes, two metal connection parts, top filaments, wires and end magnets. The insulation rod is connected with the bar-shaped metal electrodes through the metal connection parts. An included angle of 90 degrees is formed between each bar-shaped metal electrode and the insulation rod. The bar-shaped metal electrodes are capable of sliding back and forth in bar-shaped metal electrode holes. The end magnets are installed on two ends of each bar-shaped metal electrode. In use, the end magnets of the bar-shaped metal electrodes are arranged between to-be-measured insulators. The beneficial effects are that the measurement rod is suitable for insulation resistance measurement of tension resisting and vertical porcelain insulators suspended in all directions, is capable of automatically searching iron caps in all directions so that time and labor are saved, and is easy to operate and simple to adjust so that measurement speed is accelerated and working efficiency is improved.