With the rapid development of Internet of Things (IoT) technology, sensors have become the most important nodes for information exchange in the IoT. However, ensuring stable power supply and network communication of a plethora of distributed sensing nodes has become the key technical bottleneck that restricts the development of marine IoT. Herein, a self-adaptive gyroscope-structured hybrid triboelectric-electromagnetic nanogenerator (SAG-HTENG) is designed for omnidirectional wave energy harvesting. Through seamlessly integrating an electromagnetic generator (EMG) and triboelectric nanogenerator (TENG) modules into one device, the wave energy conversion efficiency can be significantly enhanced. Furthermore, through incorporating ferromagnetic electrode, remarkable peak power density of 29.92 W m