The invention belongs to the field of electronic ceramics and its manufacture, and relates to a low-temperature sintered microwave dielectric ceramic material and a preparation method thereof, which are mainly used for dielectric filters of communication systems. The material of the present invention is BaWO 4 Microwave-based dielectric ceramic material, sintering temperature 850℃~900℃, dielectric constant 5.8~9.0, loss as low as 3.70×10 ‑4 , frequency temperature coefficient ‑30~‑10ppm / ℃; its general chemical formula is BaWO 4 -xM 2 CO 3 ‑yBaO‑zB 2 o 3 ‑wSiO 2 , where M is Li + 、K + or Na + Alkali metal ions, and x, y, z, and w cannot be zero at the same time. When y=0, after sintering at 850°C to 900°C, all are BaWO 4 phase; when y is not equal to 0, the main crystal phase is BaWO 4 phase, the subcrystalline phase is BaSi 2 o 5 Mutually. During preparation, the raw materials are directly mixed according to the required chemical formula, and prepared by solid-state sintering method; the final sintering temperature is as low as 850°C, the holding time is 0.5-2h, and the dielectric performance is 5.8-9.0, which meets the high-frequency dielectric filter BaWO 4 The base LTCC microwave dielectric ceramic material can be applied in the LTCC field.