Cantilever beam is widely used in all kinds of engineering structures because of its simple structure.'The vibration model of cantilever beam with additional mass at the end under mutual excitation of permanentmagnet is called magneto-mechanical oscillator, Tracker software is used to analyze the influenee of theadditional mass at the end of the cantilever beam on the vibration characteristics according to the Euler-Bemoulli vibration theory , including the influence of vibration displacement and vibration frequency on the additional mass. The experimental and analytical results show that the vibration amplitude of the beam increasesand the vibration frequency decreases with the inerease of the additional mass. The research is conducive toprovide new ideas for sensor or energy resource acquisition, and provide more optimal design for deviceapplications.