The invention discloses a numerically-controlled aluminum part processing device comprising a base. A fixed main shield and a horizontally movable auxiliary shield are arranged on the base. A rotatable control box is arranged on the side wall of the main shield. A fixing portion used for fixing aluminum parts and a cutting portion used for cutting the aluminum parts are arranged on the base. By the numerically-controlled aluminum part processing device, users can process large-size aluminum parts through a driving turnplate and a sleeve shaft at the center of the driving turnplate, and accordingly, lathe processing range is greatly extended; since a limiting protrusion is arranged at the edge of the driving turnplate, accidental overturning of the aluminum parts can be prevented; the device is simple in structure, low in cost and high in practicability.