The invention discloses a medium low temperature co-fired ceramic material and a preparation method thereof. The medium low temperature co-fired ceramic material comprises 40-65 parts by mass of a Ba-Zn-Ti compound, 35-55 parts by mass of powder A and 0-5 parts by mass of powder B, wherein the powder A is a pre-sintered body obtained by firing the following components in parts by mass: 0-15 partsof SiO2, 0-65 parts of BaCO3, 15-55 parts of H3BO3, 0-15 parts of ZnO and 0-70 parts of Bi2O3; and the powder B is one or a combination of more of Co3O4, MnCO3, SrTiO3, La2O3, CuO and Cr2O3. The material is not reacted with silver, and can be widely applied to manufacturing multilayered dielectric resonators, microwave antennas, filters and other microwave devices. Moreover, the raw materials usedby the material are rich, the cost is low, the preparation process is simple, and industrial production is facilitated.