A method for automatically detecting a door or window fault of a door or window, wherein the method comprises the following steps: mounting at least two displacement sensors at at least two monitoring positions, respectively, being: - at a door or window frame and leaf of the door or window, - at door or window hardware of the door or window, or - at the door or window frame and leaf and at the door or window hardware, to monitor a relative position change of the door or window frame and leaf, a relative displacement of the door or window hardware, or the relative position change of the door or window frame and leaf and the relative displacement of the door or window hardware, respectively, at said at least two monitoring positions; and connecting the at least two displacement sensors to a controller which judges whether the relative position change of the door or window frame and leaf, the relative displacement of the door or window hardware, or the relative position change of the door or window frame and leaf and the relative displacement of the door or window hardware at said at least two monitoring positions exceeds a displacement threshold, and thereby perform judgment for said door or window fault; wherein said mounting the at least two displacement sensors at the at least two monitoring positions, respectively, comprises mounting: - one of the at least two displacement sensors on a mounting plate and a hinge sheet of a hinge (5, 6; 10, 11) for mounting on the door or window leaf and frame, and - another one of the at least two displacement sensors at a lock seat and a lock point on the door or window on a side of a handle of the door or window. mounting at least two displacement sensors at at least two monitoring positions, respectively, being: - at a door or window frame and leaf of the door or window, - at door or window hardware of the door or window, or - at the door or window frame and leaf and at the door or window hardware, - at a door or window frame and leaf of the door or window, - at door or window hardware of the door or window, or - at the door or window frame and leaf and at the door or window hardware, to monitor a relative position change of the door or window frame and leaf, a relative displacement of the door or window hardware, or the relative position change of the door or window frame and leaf and the relative displacement of the door or window hardware, respectively, at said at least two monitoring positions; and connecting the at least two displacement sensors to a controller which judges whether the relative position change of the door or window frame and leaf, the relative displacement of the door or window hardware, or the relative position change of the door or window frame and leaf and the relative displacement of the door or window hardware at said at least two monitoring positions exceeds a displacement threshold, and thereby perform judgment for said door or window fault; wherein said mounting the at least two displacement sensors at the at least two monitoring positions, respectively, comprises mounting: - one of the at least two displacement sensors on a mounting plate and a hinge sheet of a hinge (5, 6; 10, 11) for mounting on the door or window leaf and frame, and - another one of the at least two displacement sensors at a lock seat and a lock point on the door or window on a side of a handle of the door or window. - one of the at least two displacement sensors on a mounting plate and a hinge sheet of a hinge (5, 6; 10, 11) for mounting on the door or window leaf and frame, and - another one of the at least two displacement sensors at a lock seat and a lock point on the door or window on a side of a handle of the door or window.