The invention provides a mechanical main shaft type AC double-swinging-angle numerical control milling head, which comprises a slide pillow, a fork-shaped body and a main shaft unit, wherein the slide pillow is used for being connected on a machine tool slide plate, the fork-shaped body is connected with the slide pillow, and the main shaft unit is arranged at the top end of the fork-shaped body and is used for connecting a cutter tool. The invention is characterized in that a C shaft servo motor, a C shaft speed reducing unit and a main shaft transmission shaft are arranged in a cavity of the slide pillow, the C shaft speed reducing unit drives the fork-shaped body to rotate, a transmission structure between the C shaft speed reducing unit and the fork-shaped body is a gear pair, a main movement transmission box, an A shaft servo motor and an A shaft speed reducing are fixed in the fork-shaped body, the main movement transmission box is connected with the main shaft transmission shaft, the A shaft speed reducing box is connected with the output of the A shaft servo motor, and both the output of the main movement transmission box and the output of the A shaft speed reducing box are connected with the main shaft unit through the gear pair. The invention has the advantages that the structure of the milling head is compact, and the transmission torque of the main shaft is large. The mechanical main shaft type AC double-swinging-angle numerical control milling head is arranged on a five-shaft linkage numerical control machine tool, and can be widely used for high-precision and high-efficiency processing of various complicated curve surface parts.