In order for the straightening of deformed electrolysis potshells to provide operationally reliable equipment which makes it possible to straighten deformed potshell sidewalls even of different deformation resistance independently of one another, specifically both in the case of the potshell carrying structure and in the case of the potshell sheeting, according to the invention an elongate transportable straightening beam (14) is proposed, which with its length can extend over the distance between two potshell walls (12, 13) lying in each case opposite one another and which at each of its two end regions has a straightening jaw (15, 16) with a downwardly open U-profile-shaped through orifice (17, 18), by means of which the straightening beam can be positioned onto the top side of the potshell sidewalls, in or on the U-legs of the straightening jaws (15, 16) being arranged in each case at least one hydraulic straightening ram (25, 26, 27, 29) coming to lie parallel to the potshell bottom, and the straightening rams lying along a line of action, and that straightening jaw (16) which lies opposite the straightening jaw (15) which is just carrying out the straightening work on a deformed potshell wall (12) being firmly braced, in the manner of a tongue-like holding claw, with the top side of the potshell sidewall (13) and serving as a captively fixed counterbearing.

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