To provide a glass melting furnace and a heat-proof repairing method of the glass melting furnace capable of efficiently improving the durability of a dissolver in the glass melting furnace, improving the durability by after-installation even on the glass melting furnace during use, and elongating the service life of the dissolver deteriorated with age.

A cooler 10 having a circulating passage 11 of the cooling water used as a heat medium, is mounted inside of a metallic band plate-shaped cooling plate 12. The cooler 10 is mounted in a state of surrounding the dissolver P at a height of a liquid surface of the molten liquid glass G to partially cool the dissolver P.