The invention discloses a glass fiber yarn doubling and twisting device. The device solves the technical problems that according to two doubling and twisting technologies in the prior art, one or moresingle yarns in a first twist spindle are broken, the other single yarns still continue to backed off and wound around a second twist spindle, and deficient yarns are formed. By adopting the technical scheme, the glass fiber yarn doubling and twisting device comprises an upper half machine table portion and a lower half machine table portion; the upper half machine table portion comprises a standcolumn, a transverse rod, at least one creel spindle blade, an automatic broken yarn stopping device, a yarn guiding rod and a first yarn guiding hook; the lower half machine table portion comprisesan installing substrate, an overfeed roller, a second yarn guiding hook, a ring plate mechanism and a second twist spindle unit; according to the glass fiber yarn doubling and twisting technology, theyarn is backed off from cops inserted into the creel spindle blade, wounds around the automatic broken yarn stopping device upwards, and is turned downwards and guided to pass the yarn guiding rod, and the yarn guiding hook winds around the overfeed roller, penetrates through the yarn guiding hook and a nylon hook, is wound around a spool inserted on the spindle and obtains twisted cops through winding.