Disclosed is an automatic spring plate assembling device of high-frequency data lines. The automatic spring plate assembling device is connected to a feed inlet of a feeder and is provided with an infrared optical fiber sensor for sensing arrival of spring plates in the feeder. SATA (serial advanced technology attachment) data lines of the spring plates to be assembled are disposed in another positioning cavity of the automatic spring plate assembling device, and another infrared optical fiber sensor senses the SATA data lines of the spring plates to be assembled. The automatic spring plate assembling device has the advantages that the previous two process of riveting after manually assembling the spring plates are improved into one process, manpower is economized, and hidden quality dangers of manual assembling are avoided.