Taking full advantages of large-scale instruments to promote the reform of undergraduate experimental teaching is an important part of the “open sharing” management of large-scale instruments, and it is also one of the challenges currently faced by many universities in the management of large-scale instruments. Applying the large-scale instrument particle size and shape analyzer to the undergraduate soil mechanics experimental teaching and achieving the expected results is a beneficial attempt and exploration we have made. This provides a way and an experience for the application of large-scale instruments in undergraduate experimental teaching. The results achieved show that the improved course is not only rich in content, capable of stimulating students’ interest in learning, and conducive to comprehensively fostering students’ hands-on skills and innovative thinking, but also can significantly enhance the service efficiency of large-scale instruments, enabling them to better serve the cultivation of high-quality talents.