Breast engorgement takes place because breast milk is not implanted adequately. In consequence, the rest of the milk is collected in the ductal system triggering engorgement. If the breast engorgement is not resolved, mastitis and breast abscess will occur. This study aims to determine the effect of cabbage leaf treatment in alleviating breast engorgement in postpartum mothers. This research conducted a pre-experiment with one group pretest-posttest design method. The samples were selected with accidental sampling and analyzed with paired t-tests. The instrument of this study was a six-point engorgement scale (SPES). The statistical test showed that there was an effect of giving cabbage leaf compresses to relieve breast swelling in postpartum mothers with p = 0,000. The results of this study were expected to be a reference in treating breast engorgement by handling cabbage leaf treatment as non-pharmacological therapy.