The invention provides an improved type hidden framing glass curtain wall and an installing method thereof, and belongs to the field of curtain walls. According to the improved type hidden framing glass curtain wall and the installing method thereof, the problems that attractiveness is affected and installing is inconvenient due to the fact that fasteners of an existing glass curtain wall are exposed to the outer side are solved. The improved type hidden framing glass curtain wall comprises a wall body and glass plates; a plurality of hinged shafts are fixed to the inner side face of each glass plate, track plates are pre-installed on the wall body, a supporting seat is slidably connected to each track plate, and a plurality of hinged holes are formed in the left end of the outer side of each supporting seat; the right ends of the outer sides of supporting seats abut against the inner side faces of the adjacent glass plates on the right side, the hinged shafts of the adjacent glass plates on the left side are movably connected to the hinged holes, and the left side face and the right side face of each glass plate are in a parallel bevel shape; a sealing strip is attached to the left side face or the right side face of each glass plate, the left side faces of the adjacent glass plates on the right side are attached to the right side faces of the adjacent glass plates on the leftside in a sealed mode, and the inner edges of the attached positions of the adjacent glass plates and the outer sides of the supporting seats are arranged at intervals. The improved type hidden framing glass curtain wall is installed by adopting the hidden framing mode, the whole structure after installing is stable, and sealing performance is higher.