The invention relates to the field of electronic ceramics, and provides a microwave dielectric ceramic material, a preparation method and application thereof, a microwave dielectric ceramic body, a preparation method and application thereof, and a microwave device. The microwave dielectric ceramic material is mainly prepared from ceramic main materials and optional additives: the ceramic main materials include MgO, CaO, SiO in specific weight percentages 2 、Nd 2 o 3 、Sm 2 o 3 and TiO 2 ; The additive includes oxides of R in a specific weight percentage, and R includes at least one of Nb, Zn, Zr, Mn, Y, Ni, Cu, Mo or Al; wherein, the sum of the weight percentages of each component is 100% . The dielectric constant of the above-mentioned microwave dielectric ceramic material is continuously adjustable between 15-30, f*Q>45000 at 25°C, and has good temperature characteristics. The temperature coefficient of frequency at -40°C, 25°C, and 110°C Close to zero, high temperature stability.