The high diffuse reflective coating, which is a water-based high reflective coating applied to the back plate of a photovoltaic double glass module, is characterized by its toughened glass coating. This coating is created through instant tempering at high temperatures of 650 °C – 720 °C, followed by instant cooling to meld the glass pigment and the glass together, ensuring color adhesion and durability. The glass structure, fortified with good coloration, exhibits high strength, robust resistance to atmospheric corrosion, and excellent coverage.