The invention discloses a suspension hidden frame glass curtain wall system comprising the following structures: a steel plate rib group formed by a plurality of steel plate ribs, and the steel plate ribs are arranged at intervals; a steel plate rib straightening steel pipe with two ends respectively connecting with adjacent steel plate ribs; a fixedly connecting device used for fixedly connecting the steel plate ribs on the first side of the steel plate rib group with an existing building structure; an adjustable connecting device used for adjustably connecting the steel plate ribs on the second side of the steel plate rib group with the existing building structure, wherein the adjustable connection refers to adjust the horizontal positions of the steel plate rib group; a suspension hidden frame glass curtain wall fixedly connected with the steel plate rib group. The curtain wall system comprises the steel plate rib straightening steel pipe and connecting devices so as to effectively control vertical deformation of the steel plate ribs, and thus ensuring vertical stability of the steel plate ribs; in addition, the suspension hidden frame glass curtain wall system can prevent the main body structure deformation influences and steel structure self temperature deformation influences, thus ensuring suspension curtain wall construction reliability and complete stability.