Metal substrate composite backboard and power generation building material

The utility model particularly relates to a metal base material composite back plate and a power generation building material, the metal base material composite back plate comprises an upper functional layer, a metal base material and a lower functional layer from top to bottom in sequence, the upper functional layer is provided with an upper metal coating, an upper chemical treatment layer, an upper high polymer material layer, an upper infrared ray reflecting layer and an upper high weather-proof insulating layer in sequence, and the lower functional layer is provided with a lower metal coating. The upper metal coating is arranged close to the metal base material, and the metal base material is a carbon steel, aluminum plate-based color steel plate or an aluminum-magnesium-manganese plate; the power generation building material sequentially comprises a light-transmitting glass layer, a power generation circuit layer and a metal base material composite back plate layer from top to bottom, and the power gener