The invention discloses a core bar for a high-pitch precision spiral line and a manufacturing method of the core bar. The core bar comprises a process section (1), a porous structure (2), a spiral line coiling section (3), a planar structure (4) and a process section (1), wherein the spiral line coiling section (3) is positioned in the middle position; one end of the spiral line coiling section (3) is of the porous structure (2), the other end of the spiral line coiling section (3) is of the planar structure (4), and the other end of the porous structure (2) and the other end of the planar structure (4) are the process sections (1); and the diameter of each process section (1) is same as that of the spiral line coiling section (3), and the outer circumference surfaces of each process section (1) and the spiral line coiling section (3) are provided with coatings (5). According to the core bar for the high-pitch precision spiral line, with the special structure, in the axial direction of the core bar, one end of the core bar is of the porous structure, and a strip material of the spiral line is inserted into a hole and begins to be coiled when the spiral line is coiled; and after coiling is finished, the spiral line can be fixed by a step of the planer structure at the other end, and thus the problem of fixing the spiral line during coiling is solved.