The invention discloses a preparation method of a capacitor powder material with a high dielectric constant. The method comprises the steps of (1) preparing an inner layer material BaTi0.9Zr0.1O3 of a powder particle; (2) preparing powder with a core-shell structure. The material prepared by the invention is high in dielectric constant, and the temperature characteristic of the material meets the requirement of an EIAY5V type capacitor.