A hipbone prosthesis, comprising: a prosthesis main body , the prosthesis main body being of an arched structure, the prosthesis main body comprising a first end portion and a second end portion, and the first end portion being contacted and matched with a sacrum ; and an acetabular cup and a connecting device , the acetabular cup being connected with the second end portion in a position adjustable manner via the connecting device , a screw hole is formed in the first end portion ; a screw seat is arranged in the screw hole ; characterized in that the hipbone prosthesis further comprises a screw-rod structure; the screw-rod structure comprises a connecting seat and a rod body ; the connecting seat is connected with the prosthesis main body ; the rod body is fixed on the connecting seat ; an anti-dropping mechanism is arranged on the prosthesis main body ; the anti-dropping mechanism is arranged between the prosthesis main body and the connecting seat in a clamping manner; and the anti-dropping mechanism comprises a first anti-dropping tentacle matched with a screw accommodated in the screw hole ; the anti-dropping mechanism further comprises an anti-dropping main body ; the anti-dropping main body is arranged between the prosthesis main body and the connecting seat in a clamping manner; the anti-dropping mechanism further comprises a second anti-dropping tentacle ; the first anti-dropping tentacle and the second anti-dropping tentacle are connected with the anti-dropping main body and are extended outward; and a limiting sleeve matched with the rod body is arranged on the second anti-dropping tentacle , the screw seat is provided with a spherical inner surface. a prosthesis main body , the prosthesis main body being of an arched structure, the prosthesis main body comprising a first end portion and a second end portion, and the first end portion being contacted and matched with a sacrum ; and an acetabular cup and a connecting device , the acetabular cup being connected with the second end portion in a position adjustable manner via the connecting device , a screw hole is formed in the first end portion ; a screw seat is arranged in the screw hole ; characterized in that the hipbone prosthesis further comprises a screw-rod structure; the screw-rod structure comprises a connecting seat and a rod body ; the connecting seat is connected with the prosthesis main body ; the rod body is fixed on the connecting seat ; an anti-dropping mechanism is arranged on the prosthesis main body ; the anti-dropping mechanism is arranged between the prosthesis main body and the connecting seat in a clamping manner; and the anti-dropping mechanism comprises a first anti-dropping tentacle matched with a screw accommodated in the screw hole ; the anti-dropping mechanism further comprises an anti-dropping main body ; the anti-dropping main body is arranged between the prosthesis main body and the connecting seat in a clamping manner; the anti-dropping mechanism further comprises a second anti-dropping tentacle ; the first anti-dropping tentacle and the second anti-dropping tentacle are connected with the anti-dropping main body and are extended outward; and a limiting sleeve matched with the rod body is arranged on the second anti-dropping tentacle , the screw seat is provided with a spherical inner surface. <EOS>