Reverse hip joint prosthesis system capable of reducing dislocation risk

The invention relates to a reverse hip joint prosthesis system capable of reducing dislocation risks. The reverse hip joint prosthesis system comprises a femoral stem, a femoral cup, a polyethylene lining, a ball head and an acetabular cup which are sequentially arranged from a femur to a hip joint. The thighbone cup is installed on the thighbone stem, the polyethylene lining is installed in the thighbone cup, the ball head comprises an arc supporting face and a connecting face, the connecting face is connected with the acetabular cup, the relative position of the ball head and the acetabular cup is fixed, bone screw holes are formed in the acetabular cup, the acetabular cup is fixed in a hip joint through bone screws, and a gap exists between the acetabular cup and the ball head. The sum of the wall thickness of the thighbone cup and the wall thickness of the polyethylene lining is smaller than the gap between the acetabular cup and the ball head, and the thighbone cup and the polyethylene lining are constan