A kind of photovoltaic back polyester film

The present invention relates to a kind of photovoltaic back polyester film, the photovoltaic back includes weathering layer and barrier layer with polyester film, and polyester raw material used in weathering layer and barrier layer is aromatic polyester；Aromatic polyester content used in weathering layer is less than 0.50%, and weathering layer contains the end-capping reagent for accounting for the silicon dioxide granule of weathering layer gross weight 0.05%~5% and accounting for weathering layer gross weight 0.1%~2%；Barrier layer contains nanoscale inorganic particles and micro inorganic particle；The thickness ratio of weathering layer and barrier layer is 1:5~1:15.The photovoltaic back polyester film has excellent weatherability and barrier, can be widely applied to and photovoltaic cell industry.