1. A CATHODE OF ALUMINIUM POT, including a bottom, consisted of bottom blocks with cathode rods and having seams between blocks, filled with bottom paste , and periphery seams the lower part of which is filled with heat resistant, self solidifying material and the upper part - with bottom paste, and a protective layer, located under bottom blocks, wherein the seams between blocks are covered from the bottom with metal plates, the ends of which are bent to the top and embrace adjacent bottom blocks within the height, equal, at least, to the height of the part of periphery seam, filled with heat resistant, self solidifying material.

2. The device according to claim 1, wherein the metal plates are integrated into the continuous sheet, located under the bottom blocks.