In recent years, with advancements in instrument manufacturing, the development of spectroscopic chemometrics methods and software, and the continuous progress in the development of various sample measurement accessories, near-infrared (NIR) spectroscopy as a leading modern process analytical technology has experienced rapid growth due to its unique technical advantages. NIR spectroscopy has been increasingly embraced by various industries, especially for on-site rapid analysis and industrial online analysis, playing an increasingly important role in practical industrial and agricultural production.