The effect of B2O3-SiO2 liquid-phase additives on the sintering, microstructure, and microwave dielectric properties of LiNb0.63Ti0.4625O3 ceramics was investigated. It was found that the sintering temperature could be lowered easily, and the densification and dielectric properties of LiNb0.63Ti0.4625O3 ceramics could be greatly improved by adding a small amount of B2O3-SiO2 solution additives. No secondary phase was observed for the ceramics with B2O3-SiO2 additives. With the addition of 0.10 wt% B2O3-SiO2, the ceramics sintered at 900 degrees C showed favorable microwave dielectric properties with epsilon(r)=71.7, Q x f=4950 GHz, and tau(f)=-2.1 ppm/degrees C. The energy dispersive spectra analysis showed an excellent co-firing interfacial behavior between the LiNb0.63Ti0.4625O3 ceramic and the Ag electrode. It indicated that LiNb0.63Ti0.4625O3 ceramics with B2O3-SiO2 solution additives have a number of potential applications on passive integrated devices based on the low-temperature co-fired ceramics technology.