A machine for machining 8-shaped rib components comprises a base seat, a portal frame and a hydraulic group. A rectangular press hole is formed in the top of the base seat, the portal frame is arranged on the base seat, transverse deformation hydraulic jacks are mounted on two long sides of the rectangular press hole, and guide hydraulic jacks are mounted on two short sides of the rectangular press hole. A connecting plate is arranged on a piston rod of each guide hydraulic jack, wherein a plate-shaped load-bearing plate is mounted under each connecting plate, a baffle block is arranged on the top of each load-bearing plate, and a vertical deformation hydraulic jack is mounted on the central position of the top of the portal frame. By means of the machine for machining the 8-shaped rib components, rectangular blanks can be bent to form the 8-shaped rib components in one-step mode, and therefore operating procedures are simplified; the machine for machining the 8-shaped rib components occupies a small space, the requirement on area which is needed for placing the machine for machining the 8-shaped rib components is low, and therefore the 8-shaped rib components can be directly and conveniently produced on a site where the 8-shaped rib components are used, work efficiency is improved, and work cost is saved; and after the 8-shaped rib components are formed, the 8-shaped rib components do not need to be moved and can be used for next step work, and therefore the problem that the 8-shaped rib components are not accurate due to the fact that the 8-shaped rib components are transported and placed to a new place is effectively avoided.