A novel microwave dielectric ceramics Li2Mg2(WO4)3 (LMW) for low-temperature co-fired ceramics (LTCC) application were prepared by the conventional solid-state sintering method. Densification, phases, microstructure and microwave dielectric properties of the Li2Mg2(WO4)3 ceramics were investigated. The optimal sintering temperature of dense Li2Mg2(WO4)3 ceramic approximately ranges from 825 to 875 °C for 3 h. The ceramic specimens fired at 875 °C for 3 h exhibits excellent microwave dielectric properties: e r = 7.72, Q × f = 29,600 GHz (f = 6.0 GHz), and τ f = −15.5 ppm/°C. Moreover, the Li2Mg2(WO4)3 ceramics has a chemical compatibility with Ag during cofiring, which makes it a promising ceramic for LTCC technology application.