The utility model relates to a combined core rod used for conical cylinder body forging with a form copying method, which is characterized in that the combined core rod comprises a jaw segment (1), semi-baffle rings (2), a big cylinder segment (3), a conical segment (4) and a small cylinder segment (5), wherein the jaw segment (1) which is in shape of a cylinder is connected on the end face of the big cylinder segment (3), the big cylinder segment (3) is connected with the large end face of the conical section (4), the small end face of the conical segment (4) is connected with the small cylinder segment (5), two semi-baffle rings with the same structure are fixed on the big cylinder segment (3) by a bolt (6). The combined core rod can realize the form copying forging of the non-straight conical cylinder body, namely, forging non-straight conical cylinder body by the form copying method, thereby not only saving the material cost for forging the non-straight conical cylinder body by the form copying method and reducing the forging cycle, but also improving the forging performance of the non-straight conical cylinder body.