Abstract: Rolling-spherical triboelectric nanogenerator (R-TENG) are increasingly favored by wave energy researchers because of their excellent work performance for low frequency, highly random wave energy. To realize the quantitative research on the performance of R-TENG under specific wave conditions, this paper proposed a high-fidelity and multi-physics coupling modeling method for R-TENG based on COMSOL Multiphysics simulation software. By using the model, the multi-physics coupling effect and power output of R-TENG under specific wave conditions can be accurately and efficiently simulated. This model can be regarded as the development and improvement of static simulation methods based on electrostatic field commonly used at home and abroad. Based on this method, this model investigated the modeling and performance of a four-electrode R-TENG, and provided the high-precision, real-time and quantitative simulation of the whole process from the wave-making to the power output. This made it possible to carry out the structural optimization design and finally to provide effective means to manufacture.