The effect of CaO/SiO2 ratio on the crystallization behaviors, mechanical properties, and acid and alkali resistance properties of the prepared Ti-bearing blast furnace slag-based glass ceramics were investigated. The results showed that the crystallization temperature obviously decreased with the increase of CaO/SiO2 ratio, and the higher CaO/SiO2 ratios leaded to stronger crystallization ability. The main crystal phases transformed from CaAl2Si2O8 and CaMgSi2O6 to CaAl2Si2O8, CaMgSi2O6, and Ca2MgSi2O7 as the CaO/SiO2 ratio increased from 0.3 to 0.6. When the CaO/SiO2 increased to 0.5, a small amount of akermanite precipitated. The vickers hardness gradually decreased, and the flexural strength first increased and then decreased with an increased CaO/SiO2. The glass ceramic with CaO/SiO2 = 0.5 exhibited the highest flexural strength of 109.58 MPa. The prepared glass ceramics showed good acid and alkali resistance (> 98.30%), especially alkali resistance. Therefore, the best candidate for CaO/SiO2 ratio in the investigated Ti-bearing blast furnace slag-based glass ceramics was selected as 0.5. This work can provide the reference for preparation slag-based glass ceramics.