AB beam for electrolytic tank

The invention discloses an AB beam for an electrolytic tank, which comprises an I-bar serving as a support body; U-steel is welded on two sides of a webplate (1) of the I-bar; and the U-steel and the I-bar form an enclosed component. Compared with the prior art, the AB beam has the advantages that: the U-steel with the same height as the webplate is welded on the two sides of the webplate of the AB beam of the electrolytic tank, an enclosed cylinder is formed at the node, and the torsion resistance of the conventional component is greatly improved. The AB beam also has the advantages of simple structure, firmness and durability, and can achieve better effect under the condition of reducing investment cost.