Building heat preservation photochromic glass

The invention relates to a preparation method of building heat preservation photochromic glass, in particular to the preparation methods of heat preservation color-change printing ink and building heat preservation glass. The building heat preservation photochromic glass can achieve glass color change with outdoor temperature change to block the passing through of infrared rays outdoors and indoors so as to achieve indoor heat preservation effect. The building heat preservation photochromic glass is identical with normal glass under normal temperature status, and transparency of the building heat preservation photochromic glass is up to more than 90%. When in winter outdoor temperature is lower than about 5 DEG C, the building heat preservation photochromic glass gradually changes into red from transparent to block the transmission of the indoor infrared rays, the indoor infrared rays are reflected back indoor through the photochromic glass, and heat preservation effect is achieved. When in summer, due to the