Abstract: Against the background of “New Engineering” construction and the “Mechanics 3.0” teaching reform, this paper systematically designs and implements the application of the shearing speckle interferometry method in mechanics laboratory teaching. Based on the principle of shear interferometry, this method offers advantages such as full-field, non-contact, and real-time measurement, enabling quantitative analysis of deformation gradients and visualization of defects. It provides a new technical pathway for traditional mechanics experiments. The experimental design includes procedures such as shear direction adjustment and piezoelectric phase-shifting calibration. Typical cases—including strain measurement of a loaded circular plate, damage localization of perforated specimens, and vibration analysis—verify the feasibility and intuitiveness of the method. The results show that the experiment effectively expands the scope and form of teaching, enhances students’ understanding of experimental principles and data analysis, meets the requirements of “New Engineering” for fundamental education and innovation capability cultivation, and achieves an organic integration of research methods and teaching reform.