The invention discloses a device and a method for detecting and evaluating defects of an
elevator composite
steel belt. The device comprises an armature connected with a
handle, two permanent magnets, a guide wheel, a clamping tool and a
magnetic flux leakage testing sensor, wherein the permanent magnets are connected with the side faces, close to a traction
steel belt of a detected
elevator, at two ends of the armature respectively so that a
closed loop is formed in a
magnetic field, and the permanent magnets are connected with pole shoes; the guide wheel is connected with the armature, a guide groove matched with the traction
steel belt of the detected
elevator is formed in the guide wheel, and limiting is formed by the left and right side walls of the guide groove and two sides of the traction steel belt of the detected elevator; the clamping tool is connected with the armature, and is fixed to a surrounding rail during detection; and the
magnetic flux leakage testing sensor is connected with the armature, and is used for receiving a leakage
magnetic field generated when
metal steel wires inside the traction steel belt of the detected elevator are lost or broken. The detection device is carried through the
handle and is handheld for detection, and inspection of front-line operators in elevator inspection organizations and elevator maintenance units for the traction steel belt is facilitated.