The invention relates to a mammary gland shaping device which comprises two shaping assemblies, wherein the shaping assemblies comprise parasternal inflating bags, front chest wall inflating bags, side chest wall inflating bags and armpit inflating bags, the parasternal inflating bags are respectively arranged on certain sides of the front chest wall inflating bags, the side chest wall inflating bags are arranged on the other sides of the front chest wall inflating bags, the armpit inflating bags are connected with the side chest wall inflating bags, and the two shaping assemblies are symmetrically arranged and connected. The mammary gland shaping device has the characteristics of reasonable structural design and convenience in operation, pressing on an operation area after an operation can be satisfied, a good shaping effect can be achieved, and additionally, the quantity of fluid in all of the inflating bags can be adjusted according to actual needs; a patient can also adjust by self according to the pressure felt by the patient, and additionally, all of the inflating bags can be folded after exhaust, and effects of convenience, sanitation, safety and an application prospect are realized.