The invention discloses a water resistant glass cement, which is prepared from following raw materials in parts by weight: 15 to 20 parts of silane terminated polyurethane performed polymer, 7 to 9 parts of talcum powder, 12 to 14 parts of diatomite powder, 5 to 7 parts of lithium based bentonite, 4 to 6 parts of bamboo charcoal particle powder, 5 to 7 parts of benzimidazole carbamate, 3 to 5 parts of benzyl trimethyl ammonium chloride, 32 to 36 parts of sodium silicate, 8 to 11 parts of organic silicon resin, 9 to 11 parts of acrylic resin, 9 to 10 parts of titanium dioxide, and 6 to 8 partsof benzoyl peroxide. The water resistant glass cement has the advantages of good waterproof performance, strong bonding performance, and good mildew resistant property, is resistant to cracking, and is difficult to fall off.