The invention discloses a numerical control electromagnetic brake winding tension device for a distribution transformer. The numerical control electromagnetic brake winding tension device comprises a controller, an enameled round wire tension mechanism, a paper-covered flat wire tension mechanism, an enameled wire guide mechanism, an enameled wire buffering mechanism and an outlet guide anti-twist scratch-resistant mechanism. The numerical control electromagnetic brake winding tension device for the distribution transformer is in high-low voltage integrated design, electromagnetic force is used for braking, brake force can be remotely regulated and controlled by a numerical control system, wires are tensioned by electromagnetic brake, enameled wires and paper-covered wires can be wound and tensioned by various wire gauges, tensile force can be remotely regulated and controlled, the brake force is stable, and the tension device has anti-damage, anti-loose and anti-twist functions for the wires. The tension device is convenient and simple to operate and safe to use, and overcomes the shortcomings that a pneumatic tension device is affected by an air source, and tensile force applied to the wires in unstable. The tension device is applicable to products such as S11 and S13 oil-immersed distribution transformers, an SH15 amorphous alloy distribution transformer, a dry transformer, a prefabricated substation and a combined transformer.