The invention relates to a preparation method of an implant for orthopaedics. The preparation method of an implant for orthopaedics comprises the following steps of performing an extruding processingprocedure to obtain a barrel-shaped screw, wherein the barrel-shaped screw comprises a top and a bottom which are oppositely arranged, a taper thread segment is formed at the circumferential edge of the top, and a thread tip part is formed at the bottom; and enabling a curved surface shaped fastening top cover to be fixed to the top of the barrel-shaped screw so as to obtain an implantation screwfor the orthopaedics. The implantation screw for the orthopaedics, prepared by the preparation method of the implant for the orthopaedics, is not liable to get loose from bones.