In order to meet the demand of self-power supply of remote monitoring systems under special environment， a piezoelectric rotational energy harvester with indirect magnetic excitation was proposed. The dynamic response of the system was improved by changing the height of the damping cavity， and the volume energy density of the system was increased by coupling the piezoelectric vibrators. Through modeling and simulation analysis of harvester， the effects of exciting magnet number ratio， excited magnet distance， system equivalent stiffness and other parameters on the amplitude-magnification ratio of the system are obtained. On this basis， a prototype is designed and made， and the effects of exciting magnet number ratio， excited magnet distance， the cavity height and load resistance on the output voltage characteristics of the harvester are obtained. The results show that the number ratio of exciting magnets and the distance between exciting and excited magnets have a great influence on the maximum output voltage of the harvester， and the bandwidth of the harvester can be significantly adjusted by the cavity height， so the output voltage and effective bandwidth of harvester can be adjusted through the design of structural parameters. When other conditions are given， there is an optimal load resistance （16 kΩ） to maximize the output power （12 mW）.