The present disclosure provides a sacral prosthesis, comprising: a prosthesis main body, the prosthesis main body including two first prosthesis bodies and a second prosthesis body connected between the two first prosthesis bodies the two first prosthesis bodies and the second prosthesis body being of an integrally prototyped structure, a second end of each of the first prosthesis bodies being contacted and matched with an ilium, and a top of the second prosthesis body being contacted and matched with a lumbar vertebral body; and a screw-rod structure, the screw-rod structure including a connecting seat and a rod body, the connecting seat being connected with the prosthesis main body, and the rod body being fixed on the connecting seat. The technical solutions of the present disclosure can effectively solve the problems of unreliable supporting and easy fatigue break of the screw-rod system in the related technology.