The invention discloses a BIPV (
building integrated photovoltaics) double-layer waterproof roof
system provided with primary and
secondary stress wave profiled steel sheets. The
system mainly comprises a primary and
secondary stress wave profiled steel sheet, a photovoltaic module and a module fixing and connecting frame. Primary and
secondary stress wave profiled steel sheets are arranged to be in a double-splicing type and a whole-plate type, and each of the two types of profiled steel sheets is composed of a primary
stress wave peak, a secondary
stress wave peak and a
wave trough. And the component fixed connecting frame is fixed on the wave peak of the main
stress wave through a
fastener. A
thermal insulation structure layer and a built-in cable trough box can be laid on the lower portion of the photovoltaic
assembly and within the
wave crest range. Compared with a traditional roof profiled steel sheet, the roof profiled steel sheet is more reasonable in structure, smaller in deformation, more economical and convenient to install by adjusting the height, thickness and
wave crest width of primary and secondary stress
waves. The
assembly fixing connecting frame is only arranged at the peak of the main stress wave, and a full-length guide rail or a water tank does not need to be arranged, so that the device is more economical. The double-spliced profiled steel sheet provided with the primary and secondary stress
waves can be matched with different module widths, and has good adaptability for the trend that photovoltaic modules become larger and larger.