The invention relates to a curtain wall window which comprises a window frame. The window frame is divided into an upper window frame body and a lower window frame body; fixed glass is arranged in the upper window frame body; an inner opening glass window sash and an outer opening gauze window sash are arranged in the lower window frame body; an inner frame body is arranged in the window frame; and grooves, water collecting grooves and water draining cavities which are used for water draining as well as water draining holes communicating with the grooves and cavities and draining water to the outdoor space are formed in the inner frame body. According to the curtain wall window, water draining is smooth, water accumulating is not liable to occur, after closed, the inner opening glass window sash and the outer opening gauze window sash both can be completely folded into the window frame, and the sash surfaces of the two sashes both can be flush with the frame surface of the window frame, so that keeping of the attractiveness of the wall surface after construction is facilitated.