A long-auger mixing cast-with-pressure CFG special-shaped composite pile consists of a CFG special-shaped pile body. A plurality of axial ribs are arranged on the surface of the CFG special-shaped pile body and distributed uniformly along the external circumference, the CFG special-shaped pile body is arranged at the axis center of a cement mixing pile, and a mixing pile permeable layer is coated on the periphery of the cement mixing pile. The long-auger mixing cast-with-pressure CFG special-shaped composite pile has the advantages that the axial ribs arranged on the surface of the CFG special-shaped pile expand area contacting with the cement mixing pile on the periphery, increase side friction resistance greatly and strengthen single-pile bearing capacity. Due to the special section structure of the CFG special-shaped pile, the composite pile is suitable for construction through the method of long-auger drilling and mixing. By the aid of the advantage that long auger drills can drill the hardpan and the advantages of low cost and uniform and controllable mixing of mixing piles, the composite pile can lead construction to be easy and high-efficient, lead construction quality to be controlled easily and reduce cost greatly.