A method for manufacturing a short-circuit ring for an electric motor comprising a rotor including a plurality of rotor bars, the manufacturing method comprising at least the following steps: -: producing a body of substantially annular shape in a single piece of electrically conductive material, which develops around a reference axis and comprises a coupling face with the rotor bars which develops transversely with respect to the longitudinal reference axis; -: producing, on the coupling face of the annular body, a plurality of housing recesses which are spaced at regular distances from one another in a circumferential direction along the coupling face, each housing recess extending in a direction substantially parallel to the longitudinal reference axis and having a closed bottom wall transverse to the longitudinal reference axis so as to house, in a non-through manner, an end portion of a rotor bar, and a plurality of filler elements, each filler element extending between two adjacent housing recesses, projecting with respect to the corresponding closed bottom walls and being configured to fill, at least partially, a space between the end portions of two adjacent rotor bars once the rotor bars are housed in the corresponding housing recesses, the manufacturing method being characterized in that the step consisting in producing the plurality of filler elements and the plurality of housing recesses comprises the following sub-steps: - milling the annular body by forming the housing recesses hollowed out in the annular body at regular distances from one another and extending from the coupling face toward the inside of the annular body in a direction substantially parallel to the reference axis, the solid or unmilled portions of the coupling face between each pair of adjacent housing recesses forming the plurality of filler elements; - producing, in a circumferential direction along an inner edge and an outer edge of the coupling face, a corresponding first groove and second groove; - radially milling, at predefined positions, portions of the coupling face between the first groove and the second groove, in order to form the plurality of alternating housing recesses in sequence with solid or unmilled portions of the coupling face, each solid or unmilled portion between each pair of adjacent housing recesses forming a corresponding filler element. -: producing a body of substantially annular shape in a single piece of electrically conductive material, which develops around a reference axis and comprises a coupling face with the rotor bars which develops transversely with respect to the longitudinal reference axis; -: producing, on the coupling face of the annular body, a plurality of housing recesses which are spaced at regular distances from one another in a circumferential direction along the coupling face, each housing recess extending in a direction substantially parallel to the longitudinal reference axis and having a closed bottom wall transverse to the longitudinal reference axis so as to house, in a non-through manner, an end portion of a rotor bar, and a plurality of filler elements, each filler element extending between two adjacent housing recesses, projecting with respect to the corresponding closed bottom walls and being configured to fill, at least partially, a space between the end portions of two adjacent rotor bars once the rotor bars are housed in the corresponding housing recesses, the manufacturing method being characterized in that the step consisting in producing the plurality of filler elements and the plurality of housing recesses comprises the following sub-steps: - milling the annular body by forming the housing recesses hollowed out in the annular body at regular distances from one another and extending from the coupling face toward the inside of the annular body in a direction substantially parallel to the reference axis, the solid or unmilled portions of the coupling face between each pair of adjacent housing recesses forming the plurality of filler elements; - producing, in a circumferential direction along an inner edge and an outer edge of the coupling face, a corresponding first groove and second groove; - radially milling, at predefined positions, portions of the coupling face between the first groove and the second groove, in order to form the plurality of alternating housing recesses in sequence with solid or unmilled portions of the coupling face, each solid or unmilled portion between each pair of adjacent housing recesses forming a corresponding filler element.