Appearance detection method for thin-walled part

The invention discloses an appearance detection method for a thin-walled part. The method comprises the following steps that a to-be-detected thin-walled part is fixed on a detection surface of a ferromagnetic detection tool, so as to enable a gap between a first surface of the thin-walled part at a plurality of preset positions and the detection surface to accord with a preset initial gap, and the surface shape is detected to be consistent with the surface shape of the thin-wall part; a plurality of magnets are arranged on the second surface of the thin-wall part at intervals, so that the magnetic attraction force generated between the magnets and the ferromagnetism inspection tool conforms to the external force required by detection; and the gaps between the first surface of the thin-wall part at the plurality of detection positions and the detection surface are measured so as to determine the deformation of the thin-wall part under the action of external force required by detection. According to the appear