The invention discloses a process for manufacturing a Wolter-I reflector by means of copying. The process includes the following steps that: a precision mandrel used for copying is manufactured; a DLCfilm is applied by means of the PVD (Physical Vapor Deposition) process; a gold film reflective layer is applied by means of the PVD process; a reflector shell is obtained through electroforming; thesurface of the reflector shell is trimmed; a reflector is released from the mandrel in a low-temperature refrigeration room by using a mold release device; and the surface of the reflector is washed.According to the process of the invention, DLC is applied between the copying gold film and the surface of the mandrel so as to be adopted as a release layer, and therefore, the gold film can be effectively prevented being damaged, and the smooth release of the gold film from the mandrel can be facilitated; the gold film is plated at the rotation surface and two end surfaces of the mandrel simultaneously, and therefore, electroforming nickel can be prevented from infiltrating between the gold film at the end surfaces of the mandrel and the surface of the mandrel during an electroforming process; electroforming time can be prolonged, the strength of the reflector shell is increased, the deformation of the reflector shell is prevented, and the reflector shell is easy to shell, transport andinstall; and the mandrel is made to be separated from the reflector shell through an auxiliary shelling device in the low-temperature room, and therefore, the manufacturing cost increase of the reflector and health hazards can be avoided.