The C-shaped steel profile is automatically formed by the C-shaped steel forming machine. The C-shaped steel forming machine can automatically complete the forming process of the C-shaped steel according to the given C-shaped steel size. C-shaped steel is widely used in purlins and wall beams of steel structure buildings, and can also be combined into lightweight roof trusses, brackets and other building components. In addition, it can also be used for columns, beams and arms in mechanical light industry manufacturing.