A connecting structure of a spinal detector for a minimally invasive surgery contains: a positioning disc, a coupling member, and a plurality of metal bars. The positioning disc includes a plurality of holes defined on a front portion thereof in a sector arrangement. The coupling member is fixed on a rear portion of the positioning disc and includes a square seat and a holder. The square seat is mounted on the positioning disc and has the holder disposed thereon, and the holder has a circular boss formed thereon. The plurality of metal bars is circular and inserted in the plurality of holes of the positioning disc, and each metal bar includes a specific length.
