Abstract: Young's modulus is an important material parameter which has a great influence on natural frequency and stiffness of a structure. There are several methods to measure Young's modulus including tensile test and resonance test, whereas expensive equipment and sensors are needed. In this paper, a low-cost method of measuring Young's modulus is proposed. A cantilever was designed and a piezoelectric plate was used for sensor. Young's modulus was got by measuring the natural frequency of the cantilever and mechanical vibration theory. Sources of error were discussed. ANSYS was used for electromechanical simulation. The influence of the piezoelectric plate to the cantilever was studied and a thin piezoelectric plate was used to reduce error. The experimental result shows that the proposed method can measure the Young's modulus effectively. In future, microphone on the computer can be used for data acquisition instead of oscilloscope to reduce cost.