Casement window opening inwards

The invention discloses a casement window opening inwards. The casement window comprises a window frame and a wind sash, wherein the wind frame comprises an outer frame, an inner frame and heat insulating strips positioned between the inner frame and the outer frame; an inner construction cavity and an outer construction cavity are formed in the window frame; a water inlet opening is formed on the top of the inner construction cavity of the window frame; an opening is formed on the bottom of the window frame; a communicating vessel which is matched with the opening is arranged in the opening; a communicating groove is formed in the center of the communicating vessel; a ring-shaped connecting groove is formed on the periphery of the communicating groove; the groove wall of the communicating groove is higher than that of the connecting groove; connecting holes are also formed on the communicating vessel; the communicating vessel is in threaded connection with the heat insulating strips of the window frame through the connecting holes; the communicating groove of the communicating vessel is positioned on the bottom of the inner construction cavity and the outer construction cavity of the window frame to enable the inner construction cavity to communicate with the outer construction cavity through the communicating groove; the connecting groove of the communicating vessel is filled with a sealant and forms a sealed connecting structure with the bottom structure of the window frame; and a second drain hole is formed on the bottom of the outer side surface of the outer construction cavity of the window frame. The casement window opening inwards solves the problem of leaking rainwater inwards.