Three-dimensional calibration system

The utility model belongs to a three-dimensional calibration system, which comprises a base, a frame, a multiband backlight plate and an electric control system, and is characterized in that the frame is fixed on the base, and at least two calibration plates are arranged in the frame; the frame and the calibration plate are located in a space coordinate system, and the space coordinate system comprises an X axis, a Y axis and a Z axis; the calibration plates are connected in the frame through the cross rods and are arranged in parallel in a staggered manner; the calibration plates comprise two precise mark points, the two precise mark points are located at the lower left corner of the first calibration plate and the upper right corner of the last calibration plate respectively, and the distance between the two precise mark points is a known value. The method can accurately calibrate the space volume of the scanner camera, and can monitor the global calibration precision in real time in the calibration process