Abstract: Instead of the traditional manual sorting, visual detection technology is widely used in granular food processing to ensure the objectivity and accuracy of detection and identification and substantially increase the production quantity of high-quality granular foods per unit time.This paper introduced granular food quality issues and the modern key technologies of machine vision, reviewed the past decade latest research status of sorting machine vision technology used in the food processing and quality testing of granular sorting, and finally pointed out the existed issues in current research and future developing orientation.