The invention discloses a method for improving crude tobacco processing homogenization through a near-infrared online detection technology. In links such as crude tobacco storage after manual leaf selection before threshing and redrying and the link after threshing and redrying, the crude tobacco is detected by means of the near-infrared online detection technology, and tobacco composition combination is reasonably matched for matched threshing through fast, accurate and efficient near-infrared online detection and control means with reference to physical and chemical indicators of detected samples, so that the consistency and stability of physical and chemical indicators of redrying processing products are improved, thereby improving the quality homogenization of the crude tobacco. Therefore, the method provides a flue-cured tobacco lamina finished product with reliable and homogeneous inner quality for cigarette industrial enterprises.