Device and method for detecting and evaluating defects of elevator composite steel belt

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,