Disclosed is a spinal complex cage, which includes a cage which is made of a polymeric material, and 
metal covers which are formed on upper and lower portions of the cage, respectively, in which couplers formed on the 
metal covers are coupled to 
coupling grooves formed in the cage, such that the 
metal covers are detachably coupled to the upper and lower portions of the cage. Accordingly, because the cage and the metal cover are detachably coupled to each other, the manufacturing method is simple, and the metal cover is easily coupled to or separated from the cage, such that the spinal complex cage may be variously and quickly applied even during the 
surgery in accordance with shapes or intervals between the vertebral bodies, and as a result, a 
spinal fusion rate is excellent, and the accurate and precise 
surgical operation is enabled.