The invention discloses a method for judging the minor repair of an electrolytic tank, which carries out minor repair judgment to the electrolytic tank by initial judgment and secondary judgment. Firstly, the initial judgment is carried out from the age and the shell of the tank and the production situation before the tank breaks, and then the tank is stopped and furnace planing is carried out tothe electrolytic tank according to the initial judgment, and feasibility judgment about the minor repair of the tank is carried out from three aspects: the damage situation of a whole tank chamber cathode carbon block, the damage situation of the inner liner at side parts and whether the overall quantity of the whole minor repair is economic. Compared with the prior art, the creativity of the invention lies in that a standard is formed for the minor repair judgment of the electrolytic tank so as to standardize construction and avoid economic loss brought by the uncertainty and irregularity ofthe minor repair. Then repair is carried out to the electrolytic tank which breaks partially by the minor repair made to the electrolytic tank, thus shortening repair period, reducing heavy repair cost and prolonging the service life of the electrolytic tank.