The invention discloses a photovoltaic roof and an installation method thereof. The photovoltaic roof comprises a corrugated color steel plate and a solar cell assembly which are positioned on the roof, double-sided adhesive tapes are arranged between the raised plane of the corrugated color steel plate and the solar cell assembly, and an adhesive layer for adhering the solar cell assembly and the color steel plate is arranged between the double-sided adhesive tapes. When the photovoltaic roof is installed, the double-sided adhesive tapes are arranged at intervals along the transverse direction and the longitudinal direction of the raised plane, so that transverse gaps and longitudinal gaps are formed between the double-sided adhesive tapes; and adhesive is filled in the transverse gaps, so that the solar cell assembly and the color steel plate can be fixed. The solar cell assembly is directly adhered on the corrugated color steel plate roof, so that the photovoltaic roof is fast and convenient to install, and low in cost; and the double-sided adhesive tapes are arranged at intervals, the adhesive is injected into the longitudinal gaps, and the transverse gaps facilitate entry of air, so that solidification of the adhesive can be accelerated, and installation firmness of the solar cell assembly is ensured.