Comprehensive pipe bending machine suitable for complex structure and pipe bending process of comprehensive pipe bending machine

The comprehensive pipe bending machine suitable for the complex structure comprises a rack and a protective cover, a main shaft mechanism is arranged on a platform of the rack and slidably arranged on the platform of the rack, the main shaft mechanism comprises a main shaft base, the main shaft base drives a three-jaw chuck through a motor transmission mechanism, and the three-jaw chuck fixes a forming die; the forming die is provided with a pressing block and a spiral pipe groove which are matched with the pipe fitting. The ejector pin mechanism is arranged on the platform of the rack in a sliding mode, the ejector pin mechanism comprises an ejector pin supporting block and an ejector pin, and the ejector pin and the forming mold are oppositely installed; the pipe feeding mechanism comprises a screw rod mechanism arranged on the platform of the rack, a rotatable base is arranged on the screw rod mechanism, a conveying roller and a pressing roller are mounted on the base, and the pressing roller is suspended