Preparation method of SrTiO3 ceramic material having giant dielectric constant and low dielectric loss

The invention relates to a preparation method of a SrTiO3 ceramic material having giant dielectric constant and low dielectric loss, which comprises the following steps: mixing SrCO3 and TiO2 according to a stoichiometric ratio of SrTiO3 (1:1), performing ball milling treatment, and baking; calcining in an air atmosphere at 1000-1150 DEG C for 2-5 hours, performing further ball milling treatment on the calcined powder, and baking; adding PVA (polyvinyl alcohol) granulates, screening, and molding to obtain a ceramic body; and sintering the ceramic body in an N2 atmosphere at 1440-1500 DEG C. The SrTiO3 ceramic prepared through the method has giant dielectric constant (more than 40000) and low dielectric loss (less than 0.02) within a temperature range of (-100-200) DEG C (the test frequency range is 1-100 kHz) and a frequency range of 20 Hz-500 kHz (the test temperature range is 20-100 DEG C), and has excellent temperature and frequency stability.