An inner frame of a door or a window is disclosed. The inner frame is disposed at an inner side of a window sash, and is connected between a jamb of the door or the window sash and a door frame or a window frame. The inner frame includes a fixing portion for fixing to the jamb, a water baffle, and a connecting portion for connecting with the door frame or the window frame. One side of the fixing portion is fixed to the jamb, the water baffle is integrally disposed on the other side of the fixing portion opposite to the one side, and the connecting portion is integrally disposed on a side of the water baffle facing away from the fixing portion and is connected to the door frame or the window frame.