Metal ball head mounting structure of hip joint prosthesis

The utility model discloses a hip joint prosthesis metal ball head mounting structure, which belongs to the technical field of orthopedic implants, and comprises a femoral stem, the femoral stem comprises a stem body and a femoral neck, the tail end of the femoral neck is connected with a metal ball head, a mounting hole for accommodating the tail end of the femoral neck is arranged in the metal ball head, and the tail end of the femoral neck is connected with the metal ball head. An annular clamping groove is formed in the mounting hole; a cutting groove extending in the axial direction of the femoral neck is formed in the femoral neck, so that the femoral neck is arranged in a sectioning mode, and convex edges matched with the clamping grooves are arranged on the outer side faces of the sectioning femoral neck; an inserting opening is formed in the side, away from the tail end of the femoral neck, of the cutting groove, an opening piece used for being inserted into the cutting groove to open the femoral nec