A vertical guide for electrodes characterized in that it includes 1) an upper portion or aligning head and a lower portion that corresponds to the guide itself, whose aligning head, designed to make it easier to introduce the cathode in the guide, has cylindrical-hexahedral perforations that permit attaching the vertical guide by means of bolts or another means to the electrolytic cell's support structure made of insulating material; 2) the head formed by a cylindrical housing having a horizontal axis and two inclined symmetrical surfaces that approach each other in a downward line until they become tangential to the interior faces of the “U” profile that continues downward, so that they are similar to a funnel open on one side; 3) a lower portion made up of the actual guide, whose space through which the electrode slides must be slightly wider than it, consists of a U-type profile with flanges, and which, on the outside, has triangular, or rectangular stiffening ribs, or both types, preferably separated at regular intervals; and 4) a lower end that is introduced into the vertical housing of the union elbow.