Improving the resolution and range of angle measurement systems is crucial for the development of angle measurement technology.Compared with traditional angle measurement methods using rotating prisms,the proposed small-angle measurement experimental device based on laser self-mixing interference technology is simple in structure and low in cost,and can improve the resolution of small-angle measurement while expanding the angle measurement range,and effectively deepen students'understanding of small-angle measurement.By introducing the latest progress of scientific research into experimental teaching,the designed exploratory experiments can enrich the teaching content of college physics experiments,and play a substantial role in cultivating students'scientific research literacy and improving their proactive exploration ability.