The invention relates to an electrode resistance reducing agent for detection in a resistivity method, and belongs to a ground conductive material. In terms of mass percentage, the resistance reducingagent comprises the following components: 30-60% of bentonite, 1-20% of carbon fiber, 1-20% of stainless steel fiber, 0.1-30% of zinc powder, 0.1-30% of aluminum powder, 0.1-30% of copper powder, 10-40% of conductive cement, 0.1-10% of a retarder, 0.1-20% of sodium chloride and 1-15% of copper sulfate. The resistance reducing agent has good resistance reducing performance, and has the effect of rapid reduction of the grounding resistance between electrodes and rocks, the electrodes can be coupled with the rocks well through the resistance reducing agent, so that the detection accuracy of theresistivity method is improved significantly; meanwhile, the intensity of the resistance reducing agent is not high, recycling of the electrodes is facilitated, and the working efficiency of detectionof the resistivity method is improved; and in addition, the resistance reducing agent has simple preparation, no toxic substance containing and no pollution to the environment and underground water.