In response to the narrow operating frequency band and low energy harvesting efficiency of traditional single-well piezoelectric harvesters in low-frequency，low-amplitude environments，and the complexity and necessity for external components in conventional bistable piezoelectric harvesters，this paper proposes a novel piezoelectric energy harvester based on a local bistable structure. This structure，inspired by the physical structure of a soybean pod，combines local bistable design with piezoelectric materials，significantly enhancing the capture of low-frequency vibrational energy and broadening the operational frequency band. Experimental results demonstrated that at a wind speed of 2.5 m/s，the proposed harvester achieved a 2 077.78% higher output power density than the single-well structure. Even at a higher wind speed of 5.1 m/s，the output power density remained 66.27% higher than that of the single-well structure. These findings indicated that the local bistable structure outperformed the single-well piezoelectric harvester in most environmental scenarios. Additionally，in experiments combined with the LTC3588 circuit，the piezoelectric energy harvester with a local bistable structure showed a more sensitive response to slight increases in wind speed，and the output signal was significantly improved.