The present invention relates to a curtain box integrated window structure. In the curtain box integrated window structure, an insulation curtain accommodated inside a curtain box which is integrated into a window frame made of aluminum or plastic blocks the gap in a window frame or between windows through a curtain guide integrated onto the window frame, in order to block light and at the same time, prevent heat loss due to the outside wind coming in through the gap between the windows and heat loss through a window glass so that the heat reserving performance while indoor air conditioning and heating is on can be improved. The present invention includes: a window frame (10) which is installed on the wall while enabling a window (1) to be opened or closed; a curtain box (20) which is integrated into the upper part of the window frame, has an accommodation space (21) inside, and includes an elevation hole (22) to make the accommodation space penetrate downward; a curtain guide (50) which is linked to the curtain box and is formed on both side of the window frame; an insulation curtain (30) which is accommodated inside the accommodation space of the curtain box and covers the window being guided by the curtain guide as the elevation hole descends to block light and at the same time prevent heat loss; and a driving member (40) which elevates the insulation curtain to open or close the window.
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