The invention discloses a breast prosthesis manufacturing method based on the three-dimensional printing technology. The method comprises the steps that a tumor to be excised is analyzed and positioned according to breast medical image data of a patient before an operation, the shape, size and position of the excision part are determined, a three-dimensional digitalization tumor model is established, the radical treatment of the tumor and the demand for individualization overall beauty of the patient in the breast reestablishing process are comprehensively taken into consideration, a breast prosthesis three-dimensional model is optimized and designed according to the established tumor model and the breast shaping golden method, biologically-compatible materials conforming to the hand touch texture of the breast are selected, and the breast prosthesis is printed and formed through the biological three-dimensional printing technology. According to the breast prosthesis manufacturing method, the relation between the breast tumor and the peripheral tissue can be clearly displayed by analyzing and establishing the three-dimensional digitalization tumor model, and thus a doctor can conveniently determine the tumor excision range before the operation; the individualized accurate breast prosthesis can be provided for the patient quickly through the biological three-dimensional printing technology to improve the tumor radical treatment effect and the plastic surgery treatment effect, the living quality is improved, and the medical cost is lowered.