The utility model provides an on-load capacity regulating transformer low-voltage wire outlet structure, which comprises an iron core, a three-phase low-voltage winding and a capacity regulating switch, wherein each phase of low-voltage winding in the three-phase low-voltage winding comprises a first winding wire, a second winding wire and a third winding wire, the three sections of winding wires are wound on the iron core, three layers of distribution are formed from inside to outside, the end a3 of the first winding wire is connected with the end x2 of the second winding wire, the coil outlet ends of the three sections of winding wires are led out in the axial direction of the iron core, the coil outlet ends and the coil outlet lead wires are arranged at the same side, the coil outlet ends are respectively connected with corresponding contacts of the capacity regulating switch through the coil outlet lead wires, the coil outlet end lead wires pass along the side surface of a coil, and the arrangement direction of the coil outlet end lead wires is vertical to the lead-out direction of the coil outlet end. The on-load capacity regulating transformer low-voltage wire outlet structure has the advantages that the length of the lead wire is reduced to the maximum degree, the load loss is reduced, meanwhile, and the lead wires are tightly clamped through a conducting wire clamp, so the mechanical intensity of products is improved.