The 3D character detection system mainly obtains high-resolution VIN code 3D images through 3D contour sensors, and uses visual detection software based on CV+AI for analysis and processing to achieve character size measurement, defect detection, target recognition, and other purposes. The detection content includes serial number text content, text deviation, overall deviation, text inclination, and whether the integrity of the text meets the requirements, which can more comprehensively obtain information such as the width and height of the target.