Lightweight traction transformer

The invention discloses a lightweight traction transformer, and relates to the technical field of railway vehicles, yoke parts at two ends of an iron core respectively extend out of an oil tank, and the weight of the iron core is directly supported by an external structure instead of passing through the oil tank; the two sets of clamping pieces are positioned outside the oil tank and are respectively fixed on yoke parts at two ends of the iron core; the bearing beam is used for supporting the clamping piece, the oil tank does not serve as a middle force transmission structure, and the lightweight design can be adopted; transverse and longitudinal positioning between the end cover of the oil tank and the clamping piece is realized through a first clamping structure which is in concave-convex fit; and transverse and longitudinal positioning between the clamping piece and the bearing beam is realized through a second clamping structure which is matched in a concave-convex manner, so that stable assembly position