The invention discloses a process method for realizing porousness of the surface of an iron and steel material, which comprises the following steps of: firstly, performing nitrogen treatment on the iron and steel material by using a gas nitriding method to obtain a compound layer having the thickness of more than 50 microns and a main component of epsilon-Fe2-3N on the surface of the material; secondly, adopting chemical plating or electroplating to obtain one or more layers of Ni, Cu, Cr and other metal plated layers or alloy plated layers of which the thickness is more than 10 microns on the surface of a product obtained by a pretreatment; and finally, performing process high-temperature heating on nitrogen to ensure that the nitrogen is heated and expanded to wear through the plated layers and is released in surface plated layers and nitriding layers to leave a large quantity of holes formed during the expansion of the nitrogen so as to obtain the iron and steel material with a porous surface. By adopting the method, a porous structure of which the aperture size is between 1 and 50 microns and the surface porosity is over 30 percent can be formed on the surface of the iron and steel material.