Three-dimensional linear detection method and system

The present invention discloses a three-dimensional linear detection method and system, which comprises a moving platform, an angle adjusting mechanism, an image capturing device and an angle recognition/control unit. The moving platform is for placing the test piece. The angle adjustment mechanism is located on the mobile platform. Each image capture device is disposed on each angle adjustment mechanism to capture multiple detection images of the specimen. The angle recognition/control unit includes an image detection module for identifying whether each lens axis is the same axis as the normal of the facing detection surface, and drives each lens axis to be the same as the normal of the respective facing detection surface, or starts the image detection module to splice the detection images into a set of two-dimensional expanded planar images, and performing characteristic identification processing on the planar images, so as to improve the detection rate and processing efficiency.