Provided is a device for detecting the curved contour of a section of the planar bent sheet 
metal part. The device comprises a mechanical device and a control device. The control device comprises a control box, a PLC, a single-
chip microcomputer and a computer. The mechanical device comprises a frame, an X-direction translation module, a Y-direction translation module and a 
linear array CCD camera. A detecting method adopting the detecting device mainly comprises the steps the contour position information collected by the 
linear array CCD camera and Y-module coder data of the mechanical deviceare combined and serve as a 
Y coordinate value of a 
metal plate contour two-dimensional diagram after 
data processing, position data fed back by a X-module 
servo motor coder in the mechanical deviceis adopted as an 
X coordinate value of the 
metal plate contour two-dimensional diagram, metal plate contour circulating scanning and contour 
point data collection are completed through control of a driving program, and a two-dimensional 
point cloud file related to the curved contour of the sheet metal part is obtained after upper 
computer data processing is carried out. The device is automatic, efficient and cheap and can extract contour data fast and conveniently.