Based on the distributed parameter model of piezoelectric energy harvester, the vibration and power of cantilever piezoelectric energy harvester under galloping are further theoretically analyzed, meanwhile the analytical solution of tip′s onset speed and harvested power from onset to galloping are obtained in this paper. The cantilever piezoelectric energy harvesters with a regular tri-prism tip and a regular quad-prism tip are tested in a closed direct-flow low-speed wind tunnel. The experimental results show that their harvested power reaches 0.125 9 mW and 0.248 5 mW, respectively. Comparing the harvested power and its history curve, it is found that the theoretical solutions are in good agreement with the experimental ones, showing a high accuracy of the theoretical model.Thought the theoretical model analysis, the larger the wind speed and the smaller the tips mass are, the higher the power of energy harvester will be. For the energy harvester at different conditions, there are optimal external load resistance values, and there are also two optimal external load resistance values at low wind speed.