The utility model provides a photovoltaic curtain wall DC wiring system, include: photovoltaic module is with the electric terminal box of being connected of photovoltaic module, with the electric photovoltaic cable of being connected of terminal box to and be used for supporting photovoltaic module's fossil fragments, the photovoltaic cable is hidden to set up and is being lain in in the cavity of opening on the fossil fragments. The utility model discloses a photovoltaic curtain wall DC wiring system sets up the cavity on fossil fragments, the photovoltaic cable is hidden and is set up in this cavity, has solved the cable and has exposed at indoor technical problem, does not influence indoor other decorative structure or other line arrangement to the potential safety hazard has been reduced.