An energy-saving glass includes a glass substrate, and a periodic metal layer deposited on the glass substrate and having a honeycomb array of round holes. A method of manufacturing the energy-saving glass includes: providing a template having multiple template spots arranged in a honeycomb array; forming on the template a transfer metal layer having multiple metal spots disposed respectively on the template spots; transferring the metal spots onto a photoresist layer on a glass substrate; etching the photoresist layer exposed from the metal spots to leave photoresist spots underlying the metal spots on the glass substrate; forming a periodic metal layer around the photoresist spots; and removing the photoresist spots.