The invention relates to a circulation device used for the integral cooling of fibers in a superpower fiber laser, which is characterized in that the device comprises a fixed fiber heat conduction lower-plate, a fixed fiber heat conduction upper-plate, a cold plate and a water-cooling machine; the cold plate is a shell body provided with a water inlet and a water outlet, and cooling water passes through the shell body; the fixed fiber heat conduction lower-plate is close fixed on the cold plate; pinching screws are screwed in fixing holes of the fixed fiber heat conduction upper-plate and thefixed fiber heat conduction lower-plate to form a dismountable connection relation; doubly coated fibers of the superpower fiber laser are positioned between the fixed fiber heat conduction upper-plateand the fixed fiber heat conduction lower-plate; then the water inlet and the water outlet of the cold plate are communicated with the water-cooling machine through a water inlet conduit and a watero utlet conduit so as to form a circulation passage for the cooling water. The circulation device leads the operation material that is the doubly coated fibers in the superpower fiber laser to realizethe constant temperature refrigeration, to obtain stable and uprated laser output.