The present invention discloses a method for automatically detecting door or window faults, comprising the following steps: mounting a displacement sensor at at least one monitoring position of the door or window frame and leaf and/or door or window hardware to monitor a relative position change of the door or window frame and leaf and/or relative displacement of the hardware at said at least one monitoring position; and connecting the displacement sensor to a controller which judges whether the relative position change of the door or window frame and leaf and/or relative displacement of the hardware at said at least one monitoring position exceeds a displacement threshold, and thereby perform combined judgment for door or window faults. The present invention further discloses a mechanism for automatically detecting door or window faults. The present invention can automatically detect possible faults occurring during use of the door or window, and thereby eliminate hidden risks endangering the user and other persons' personal safety, and exhibit important social significance.