The utility model discloses a low-voltage foil type winding outgoing line structure, which comprises a flexible connection outgoing line row, the flexible connection outgoing line row is formed by superposing a plurality of layers of foldable pure copper strips, one end of the flexible connection outgoing line row is used for being connected with winding copper foil, the other end of the flexibleconnection outgoing line row forms an outgoing line end of the flexible connection outgoing line row, and the outgoing line end is folded into more than two layers. Correspondingly, the utility modelfurther discloses an oil-immersed three-dimensional wound core foil-wound transformer comprising the low-voltage foil winding outgoing line structure. By adopting the outgoing line structure, the ironcore window height of the three-dimensional wound iron core foil wound transformer can be greatly reduced.