The invention discloses an automatic winding device of a molybdenum filament hook for a wire stretching machine, in the winding device, the whole working process is driven by the backward sliding of a main slide block, the filament is transmitted by a filament transmitting gun, the filament is cut by a cutting mechanism and the cutting mechanism drive a rack drive mechanism to rotate a rack, thereof a core shaft can rotate a wire drawing block to wind the cut filament, at last the needed molybdenum filament hook is formed, the filament hung on the molybdenum filament hook can not fall off, thus prolonging the service life of the bulb, the winding device is used on the wire stretching machine to automatically complete the winding process of the whole molybdenum filament hook, the reset function can be automatically completed, the production efficiency is high, the wound molybdenum filament hook has good quality.