The invention relates to the technical field of medical instruments, in particular to a delactation bag. The delactation bag comprises a bag body, a medicine containing cavity, an adjusting bag and a bag mouth. The delactation bag is characterized in that the bag body is uniformly divided into two parts by a middle dark line, the left-side bag body and the right-side bag body are each internally provided with a cup, a nipple hole is formed in the center of each cup, and massaging convex points are uniformly distributed on the inner side of each cup. The delactation bag is reasonable in structural design, not only can enable all parts of two breasts to uniformly make contact with delactation medicine, but also can massage all the parts of the breasts due to presence of the massaging convex points distributed in the cups and has a better delactation effect; nipples are placed in the nipple holes, and therefore the condition that the nipples are stimulated by extrusion, friction and the like can be prevented; the bag body is made of an all-cotton material, and therefore the delactation bag is comfortable, efficient, clean and suitable for use and popularization.