The invention discloses a breast augmentation prosthesis, and belongs to the field of plastic surgery machines. The breast augmentation prosthesis comprises an outer shell, the outer shell is a hollow cavity, the outer contour of the outer shell is in the shape of the human breast, the bottom of the outer shell is sunken inwards, a growth area is arranged in the middle in the outer shell, and filling areas are arranged at the positions, on the two sides of the growth area, in the outer shell. The breast augmentation prosthesis has the advantages that the breast augmentation prosthesis can perfectly adapt to each individual, has the good hand feeling and form, meanwhile has high safety and is good in rebound resilience, not prone to deforming and good in tissue compatibility, human body tissue rejection and attacks can be avoided, the possibility that complications are caused by implants is reduced, no toxic and side effect is generated to the human body, and a person in whom the breast augmentation prosthesis is implanted can obtain the body feeling the same as that of the original tissue.