The utility model relates to a prevent strong wind rain water leakage window, it hinges the inside casing on the window frame including installing window frame and a side on the wall body, being provided with baffle in the annular on the window frame inside wall, forming cyclic annular right angle terrace in should between baffle and the window frame, this right angle terrace is used for holding the inside casing, it has glass to inlay on the inside casing, the inside casing lateral wall is provided with cyclic annular outer the following that covers half of window frame surface, the outer tip of following is provided with and follows the cyclic annular flaring of vertically outward, be provided with the annular groove that holds the flaring on the window frame surface. This device simple structure, water -proof effects is good. (B /)