<p>A novel bifacial photovoltaic wall combining thermochromic material and double layers PCM (BPVW-TC+PCM) is proposed to passively regulate building heat gain and photovoltaic (PV) power generation through the dynamic color change properties of thermochromic glass and the latent heat storage capacity of the phase change material (PCM). Physical and numerical models of the composite wall system were developed, followed by numerical simulations to analyze indoor air temperature, PV power generation, and annual energy consumption in both ordinary and composite wall rooms. Additionally, optimization studies were conducted to determine the ideal phase change layer temperature and arrangement. The results indicate that this novel wall system significantly reduces indoor air temperature fluctuations and enhances PV power generation by approximately 16% in both summer and winter compared to conventional mono facial PV walls. The system achieves its lowest energy consumption when the high-temperature phase change layer is maintained at 28 °C and the low-temperature phase change layer at 18 °C, with both layers positioned on the interior side, resulting in an energy saving rate of 22.6%.</p>