The automatic one-button flash-splicing special measuring instrument is a one-button fast special measuring device designed and manufactured by our company for multi-dimensional detection of large-scale two-dimensional workpieces. The equipment has the characteristics of long measuring stroke, high detection efficiency and high detection accuracy. The equipment is equipped with rich image measurement modules to meet the measurement of different workpieces. The equipment consists of a high-precision control system and a high-precision image detection module. The motion control system adopts imported servo motors with grinding ball screws and a high-resolution grating ruler, which has high positioning accuracy and low noise. The image detection module adopts a high-resolution camera, an automatic zoom lens, a multi-angle ring light source and an LED remote core cold light source, which can realize the contour of different workpieces. The device contains an extension module.