The invention discloses a low-voltage lead structure of a transformer. The low-voltage lead structure is positioned at the upper part of the triangularly distributed three phases of coils, an includedangle of 120 degrees is formed between the phase-A outgoing end and the zero-phase outgoing end of the phase-A coil, an included angle of 120 degrees is formed between the phase-B outgoing end and the zero-phase outgoing end of the phase-B coil, and an included angle of 120 degrees is formed between the phase-C outgoing end and the zero-phase outgoing end. The head and tail wire outlet ends of each phase are distributed at an angle of 120 degrees, the electrical distance of the wire outlet ends is large, and the operation is convenient; meanwhile, the relative positions of the head end and the tail end and the trend of the outgoing line row are adjusted through the three outgoing lines, the effect of adjusting line resistance is achieved, and balance of the line resistance is guaranteed.