Triboelectric nanogenerators (TENGs) are effective in harvesting high-entropy low-frequency wave energy, yet traditional TENGs struggle to align with the meter-scale wavelengths prevalent in marine environments, significantly impairing their wave energy conversion efficiency. Addressing this, the One Meter TENG (OM-TENG) is introduced, a pioneering advancement in TENG design that extends the shell size to 1 m. This innovation features a novel lantern-shaped stacked silicon-manganese steel sheet configuration, optimizing internal space usage, and achieving a single-cycle transfer charge of 60.82 µC and a friction layer area density of 1.76 cm−1. Furthermore, by integrating a segmented limiter device for rational control of different sliders, effective contact separation among numerous TENG units is realized. Comprehensive evaluations through theoretical analysis, multiphysics field numerical simulations, sensor data analytics, and comparative experimental measurements have unequivocally demonstrated OM-TENG's superior capability in capturing meter-scale wave energy under actual environmental conditions, alongside its remarkable anti-capsize performance. Achieving peak outputs of 584 V and 444 µA, OM-TENG can power 96 2 W LEDs and drive wireless communication modules, marking a significant step forward in the efficient utilization of wave energy and the design of large-scale TENGs.