The tensile method is generally used to measure the young’s modulus of metal wire in college physics experiment courses,but the function of the experimental device is not perfect enough to support the experimenter to debug strictly according to the theoretical optical path,the measurement results are inaccurate, and it is not conducive to cultivating students’rigorous academic attitude.In view of the above problems, a new young’s modulus experimental instrument is developed,and the angle detection device is introduced to realize the real-time measurement, display and debugging of the inclination of the optical lever plane mirror and ruler. and a new experimental scheme is compiled.The prototype is built and experimental verification is carried out The data error and experimental process are significantly improved.