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This utility model relates to a crystal head testing and error-proofing device in the field of crystal head error-proofing technology. It includes a processing table with a rectangular hole. A rectangular plate is rotatably connected inside the rectangular hole via a pair of rotating shafts. When adjusting the angle of the crystal head, the moving frame must be manually pulled upwards to remove the lower end of the connector from the insertion slot. Simultaneously, the connector block pulls up a spring, causing it to be stretched further. Then, the rectangular plate is rotated up and down, causing the crystal head to rotate up and down as well, thereby adjusting the angle of the crystal head. After adjusting the angle, the external force applied to the moving frame is removed, causing the spring to pull the connector block, the moving frame, and the connector downwards together, allowing the lower end of the connector to be inserted into the corresponding insertion slot, thus fixing the rotating shaft and the rectangular plate. This application provides a simple and time-saving procedure for adjusting the crystal head, making it convenient for personnel to use when processing and testing crystal heads.