Comprehensive pipe bending machine suitable for complex structure and pipe bending process thereof

The invention discloses a comprehensive pipe bending machine suitable for complex structure. The comprehensive pipe bending machine comprises a rack and a protective cover, a ejector pin mechanism, apipe feeding mechanism and a pipe cutting and pressing mechanism, wherein a main shaft mechanism is arranged on a platform of the rack, the main shaft mechanism is arranged on the platform of the rackin a sliding mode, the main shaft mechanism comprises a main shaft seat, the main shaft seat drives a three-jaw chuck through a motor transmission mechanism, and a forming mold is fixed through the three-jaw chuck, and the forming mold is provided with a pressing block and a spiral pipe groove which are matched with a pipe; 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 lead screw mechanism