Abstract: For the defect detection of coated grain and low burning temperature grain, such as debonding, bubbles, etc., at present, the traditional manual detection method is mainly used, which has some problems, such as low detection efficiency, strong dependence on subjective experience and poor quality stability. In order to realize the efficient detection of coated grain and low burning temperature grain, and meet the rapid and batch development requirements of coated grain and low burning temperature grain under the situation of normalized high-density emission, a laser shearographic detection system based on biaxial motion is developed. The detection system mainly completes defect detection, the remote starting of the laser, the driving of the servo motor, the automatic positioning and realizing the data communication in the terminal computer. The experimental results show that the developed laser speckle detection system can be compatible with many types of coated grain and low burning temperature grain, with high detection efficiency and high precision.