The present invention relates to technical field of inorganic non-metal materials, particularly to a low temperature sintering high voltage ceramic capacitor dielectric, wherein the formula of the dielectric comprises, by weight, 60-91% of BaTiO3, 1-13% of SrTiO3, 2-15% of BaZrO3, 0.05-2% of Nb2O5, 0.1-1.5% of ZnO, 0.03-2.0% of Co2O3, 0.5-6% of ZnB2O4 glass powder, and 0.5-4% of BaCu(B2O5). According to the present invention, the conventional ceramic capacitor dielectric preparation method is adopted, and ordinary capacitor ceramic chemical raw materials are utilized to prepare the lead-free and cadmium-free high dielectric high voltage ceramic capacitor dielectric so as to substantially reduce a sintering temperature of the ceramic capacitor; and the dielectric is suitable for preparation of monolithic ceramic capacitors and multi-layer ceramic capacitors, wherein a ceramic capacitor cost can be substantially reduced, a withstand voltage can be increased, an application range of the ceramic capacitor can be broadened, and no environment pollution is generated during preparation and use processes.