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With the development of computer and information technology,visual detection technology is introduced into the strain measurement of sheet metal part forming.Based on the advanced image processing software HALCON,uses the principle of binocular stereo vision to calibrate the cameras to acquire the cameras’ internal and external parameters,and analyzes the image quantity's influence on the calibration accuracy. Using the disparity principle to get three-dimensional coordinates of the matching points ,according to the length change of the elliptical axis after circular grid deformation,calculate the true strain ,analyze the influence of matching error on 3D reconstruction,visualize the strain with OpenGL language.Finally,the sheet metal forming grid strain measuring system is achieved by calling the operator library of HALCON and programming in VC6.0.Experiments showed that the system can achieve the measurement requirements in accuracy and speed aspects.