A detachable prosthodontic device, characterized by comprising: an abutment for connecting with an implant and comprising an abutment collar and a hollow chamber, wherein the hollow chamber comprises an opening and an outer surface, and a screw hole is arranged on the abutment wall of the hollow chamber; a suprastructure provided with a receiving region and an inner surface surrounding the receiving region; and a screw comprising a screw head and a screw rod, wherein the screw head comprises a contact member and a guiding member, the screw rod is provided with a screw thread, the contact member comprises a top surface, the guiding member is positioned between the contact member and the screw rod, and when the screw is mounted in the screw hole, a portion of the screw head protrudes outward from the outer surface of the hollow chamber but the screw does not penetrates the suprastructure; wherein when the suprastructure is sleeved onto the abutment, partial area of the outer surface of the hollow chamber contacts with partial area of the inner surface of the suprastructure, and the screw head supports an opposing side of the inner surface to apply a force onto the inner surface to thereby detachably retain the suprastructure onto the abutment; wherein a guiding region having a shape matching with the guiding member is arranged in the screw hole, when the screw is mounted in the screw hole, the guiding member is positioned in the guiding region and the contact member protrudes outward from the outer surface of the hollow chamber, and when the partial area of the outer surface of the hollow chamber contacts with the partial area of the inner surface of the suprastructure, the contact member supports the opposing side of the inner surface to apply the force onto the inner surface. an abutment for connecting with an implant and comprising an abutment collar and a hollow chamber, wherein the hollow chamber comprises an opening and an outer surface, and a screw hole is arranged on the abutment wall of the hollow chamber; a suprastructure provided with a receiving region and an inner surface surrounding the receiving region; and a screw comprising a screw head and a screw rod, wherein the screw head comprises a contact member and a guiding member, the screw rod is provided with a screw thread, the contact member comprises a top surface, the guiding member is positioned between the contact member and the screw rod, and when the screw is mounted in the screw hole, a portion of the screw head protrudes outward from the outer surface of the hollow chamber but the screw does not penetrates the suprastructure; wherein when the suprastructure is sleeved onto the abutment, partial area of the outer surface of the hollow chamber contacts with partial area of the inner surface of the suprastructure, and the screw head supports an opposing side of the inner surface to apply a force onto the inner surface to thereby detachably retain the suprastructure onto the abutment; wherein a guiding region having a shape matching with the guiding member is arranged in the screw hole, when the screw is mounted in the screw hole, the guiding member is positioned in the guiding region and the contact member protrudes outward from the outer surface of the hollow chamber, and when the partial area of the outer surface of the hollow chamber contacts with the partial area of the inner surface of the suprastructure, the contact member supports the opposing side of the inner surface to apply the force onto the inner surface.