The invention, belonging to water treatment technical field, discloses the electric pole used for removing nitrate in water. The invention uses one of noble metals (palladium, platinum, gold, rhodium, and ruthenium) and one of non noble metals (copper, tin, indium, zinc and silver) to modify the activated carbon fiber and make the electric pole. The method uses the said electric pole as negative pole, and uses graphite and lead oxide as anode, deoxidizing the nitrate at the condition of energisation. The electric pole is cheap and high activity, and the invention is simple operation, convenient management and suits for small-scale decentralized feedwater treatment.