The utility model belongs to the technical field of CFG (Cement Fly-ash Grave) pile construction machinery in roadbed and ground reinforcement projects, in particular to a pile head cutting machine for CFG piles, which solves the problem that the conventional cutting machine has imperfect performance and can not satisfy pile head cutting requirements of CFG piles. The pile head cutting machine for CFG piles comprises a control system. The control system also comprises a vertical fine-tuning control system of a cutting saw, the vertical fine-tuning control system comprises a vertical transmission screw rod, the vertical transmission screw rod is matched and connected with an upper screw fixed relative to a vertical support framework and a lower screw capable of sliding relative to the vertical support framework and being fixed relative to the vertical support framework, and the lower screw is connected with an electric motor through a connection part. The pile head cutting machine realizes three-dimension cutting control in the circular direction, the radial direction, and the vertical direction in the cutting process, ensures the stable performance of the cutting device in the cutting process, improves the work efficiency of standardized operation, and reduces needed operation space and dust pollution in construction.