A cable hook machining positioner comprises a transverse flat iron placement supporting plate fixedly connected to the upper side of a base. Left and right corresponding supporting frames are fixedlyconnected to the flat iron placement supporting plate. A transverse rotating shaft is hinged to the left and right supporting frames. The rotating shaft between the left and right supporting frames isfixedly connected with a plurality of parallel positioning pointers arrayed left and right. The positioning pointers are perpendicular to the rotating shaft. After the rotating shaft rotates, the free ends of the positioning pointers abut against the upper side of the flat iron placement supporting plate. A transverse hook adjusting plate is fixedly connected with the upper side of the base and perpendicular to the flat iron placement supporting plate and is provided with a plurality of adjusting grooves arrayed left and right. Adjusting screws are movably connected into the adjusting groovesleft and right and transversely arranged and are perpendicular to the hook adjusting plate. The outer ends of the adjusting screws are fixedly connected with vertical adjusting baffles which are perpendicular to the hook adjusting plate.