The application of intelligent manhole covers greatly reduces the difficulty of manual inspections and reduces the safety risks of people's lives and properties. The article studies a cymbal piezoelectric energy harvester, which effectively improves the battery life of the smart manhole cover wireless monitoring node battery and reduces the cost of manual inspections. The paper analyzes the working principle of the collector, and uses ANSYS Workbench software for simulation optimization, and also studies the key factors affecting the output performance. The prototype of the cymbal-type power generation device was processed and assembled, and the test was completed. The results show that the prototype has an output open circuit voltage of 102 V and an output power of 4.11 mW under an impact load of 250 ms pulse width and 0.5 MPa, which can effectively improve the endurance of the manhole cover monitoring node.