The invention relates to a method for reducing partial heating of a transformer shell, aiming at solving the problems that a low-voltage side of the transformer shell is not made of a non-magnetism-conducting material so that overheat at the peripheries of a flange under a low-voltage sleeve and an ascending flanged base of the low-voltage side is caused by eddy-current loss when large current flows through the low-voltage side. The method is characterized in that according to a parallel circuit current diffusion principle, the current of a branch circuit with large resistance is small and the current of a branch circuit with small resistance is large; a short-circuit copper bar is additionally arranged at the periphery of a partial overheating part in the low-voltage ascending flanged base of the transformer shell to form a loop, so as to lead eddy current to the short-circuit copper bar which has smaller resistance and does not conduct magnetism; the copper bar is grounded so that the eddy-current loss is reduced and the temperature of an overheat point of the transformer shell is reduced. The heat dissipation effect is good, the construction is convenient and the cost is low; a detachable short-circuit copper bar structure is adopted so that the work including normal maintenance and overhauling and the like of a transformer is not influenced.