The invention discloses a breast beautifying device capable of dredging lactiferous ducts. The breast beautifying device comprises a breast exposing bra and two bra cups, wherein the breast exposing bra is formed by connecting two front parts; each front part is provided with a circular breast window relative to a corresponding breast so that the breast on the corresponding side can be exposed; an annular connecting piece is arranged on each front part and is positioned on the periphery of the corresponding breast window; each bra cup is a hollow component which is similar to a circular truncated cone; the generatrix of each bra cup conforms to the feature of the curve of the breasts; an end hole is formed in the upper end of each breast cup while a cup ring is arranged at the lower end of each breast cup; the periphery of each cup ring is connected with the breast exposing bra through the corresponding annular connecting piece; a plurality of circles of bead guiding tubes are spirally twined on the outer side of each breast cup which is similar to the circular truncated cone in the radial direction; an air outlet hole is formed in one end, which is close to a lower ring side of the corresponding bra cup, of each bead guiding tube; an air inlet hole which can be connected with an air bag is formed in one end, which is close to an upper ring side of the corresponding bra cup, of each bead guiding tube; a plurality of rolling beads are arranged in each bead guiding tube; each air bag applies positive pressure or negative pressure to the corresponding bead guiding tube through the corresponding air inlet hole, so that the corresponding rolling beads spirally move back and forth in the corresponding tube, and the periphery of the corresponding breast is mechanically massaged; and the edge of the upper end of each bra cup is connected with an openable cup cover which is in the shape of a hollow arc-shaped component.