The invention relates to a vibration monitoring method and device and a vibration analyzer. Through self-defining the magnitude of vibration signals, that is, adjusting set parameters, interference is thus screened and effective vibration is detected, thereby providing accurate measurement data or alarm output for the further experiment and analysis. The monitored vibration magnitude is adjusted through a sortware mode, so that only a relatively-high-sensitivity vibration collector needs to be selected without adjusting the vibration collector itself, and the method is high in efficiency and good in monitoring effect.