In a roll-forming machine having pairs of forming roll sets and two first and two second auxiliary shape-forming wheel sets for processing C-shaped component or Z-shaped component, each first auxiliary shape-forming wheel set having, in addition to an upper auxiliary shape-forming wheel, a bottom auxiliary wheel for working with a respective lateral shape-forming wheel to ram each of two sides of a C-shaped or Z-shaped component into a 90° contained angle, and each second auxiliary shape-forming wheel set having, in addition to an upper auxiliary shape-forming wheel, a bottom auxiliary wheel for working with a respective lateral shape-forming wheel to ram each of two sides of a C-shaped or Z-shaped component into a 90° contained angle, so that the operator needs not to shut down the machine or to change or calibrate the machine parts when wishing to change the processing from a C-shaped component processing mode to a Z-shaped component processing mode or from a Z-shaped component processing mode to a C-shaped component processing mode.