Detecting device for suspension element of elevator

The invention discloses a detecting device for a suspension element of an elevator. The suspension element is a flat stretching assembly composed of a plurality of steel wire rope ropes and a wrapping layer; the detecting device comprises a main frame and a plurality of detecting units; each detecting unit comprises a magnetic field exciter and a plurality of magnetic flux detecting element; two electrodes of the magnetic field exciter are close to the flat stretching assembly to magnetize the steel wire core ropes between the two electrodes; each magnetic flux detecting element is positioned between the two electrodes of the magnetic field exciter; the main frame is movably mounted on an elevator system or a fixing assembly in an elevator shaft; the detecting units are movably mounted on the main frame; the main frame and the detecting units can transversely move in the width direction of the flat stretching assembly to enable each steel wire core rope to be aligned to the corresponding at least one magnetic flux detecting element. According to the detecting device for the suspension element of the elevator, when the whole flat stretching assembly offsets or randomly offsets in the width direction, the magnetic flux detecting elements can be kept aligning to the steel wire core ropes in the correspondingly detected flat stretching assembly, and thus the defect inside can be detected accurately.