The invention provides an application of a porous carbon electrode material in an electrosorb technology. The porous carbon material is large in specific area, large in capacitance and uniform in pore size distribution and is prepared by uniformly grinding an inorganic base and ethylenediamine tetraacetic acid or a salt thereof in a mass ratio of 1:(1-4) and calcining for 1-2 hours in a tubular furnace by raising the temperature to 600-800 DEG C at a temperature raising rate of 5-10 DEG C/min under the protection of an inert gas. An electrosorb electrode module prepared from the porous carbon material is applied to a seawater desalination electrosorb technology, and experiments show that the porous carbon material has better adsorbability compared with a common carbon material.