Open-type double-layered curtain wall system

Provided is an open-type double-layered curtain wall system. Inner-layer curtain wall modules are spliced together so that an inner layer is formed; edges of the inner-layer curtain wall modules are connected with anchor plates which are connected with keels via T-shaped connecting pieces; the T-shaped connecting pieces are fixedly connected with first L-shaped connecting pieces; the first L-shaped connecting pieces are connected with bearing pieces; the bearing pieces are in bell-and-spigot joint with plug-in pieces; the plug-in pieces are connected with second L-shaped connecting pieces; the second L-shaped connecting pieces are connected with an outer-layer curtain wall; outer-layer curtain wall modules are spliced together, so the outer-layer curtain wall is formed; and the inner-layer curtain wall modules are parallel to the outer-layer curtain wall modules and gaps are arranged among the modules, so the open-type double-layered curtain wall is formed. The curtain wall system is simple in structure and convenient to install. Loss of the double-layered curtain wall is saved, and airflow exchange among inner/outer-layered curtain walls is ensured. In addition, the inner/outer-layered curtain walls are connected via connecting systems in a simple way of bell-and-spigot joint. The open-type double-layered curtain wall system can be widely applied for installation of curtain walls.