The invention discloses a CTS array antenna system with a wide angle scanning function. A pair of quasi-planar wave discrete apparatuses are connected between a CTS antenna array surface and a slab waveguide feed source, so that discretization of the incident quasi-planar waves is realized, and a coaxial mode is converted, so that a conventional power division network is omitted; and by virtue ofan active assembly arranged between the pair of the quasi-planar wave discrete apparatuses, phase-control scanning of a wave beam is realized, thereby realizing relatively low feed loss and relativelylow heat consumption. Therefore, the CTS array antenna system with the wide angle scanning function disclosed in the invention has the characteristics of broadband, high gain and wide angle scanningand the advantages of low profile, low cost and low heat consumption.