The present invention provides a body building underwear, belonging to female underwear technology field, which structure includes two cover cups connecting with each other as well as giguillette and gallus connecting to the cover cups separately, setting a middle-assembling bar between the inner surface of two cover cups, setting supporting pressing bar in the inner surface of two cover cups, setting resistance bar in the outer surface of two cover cups, setting lifting-resistance pressing bar under the inner surface of the two cover cups, setting alloy bar in the inner surface of the gallus at the position near by the cover cup. The body building underwear of the present invention changes the hemicycle cotton-strip for containing steel loop to peach-shape composed of three arc lines when cutting out, the whole face piece in the cover cup is changed two pieces open-bag type for containing cotton-strip, using three clipping to cut out the cover cup, the underwear of the present invention has the advantage of reasonable design, beautiful wearing, which can decrease female galactophore disease occurring ratio and is suitable for female wearing of various age phases.