Preparation method of nano-scale strontium titanate powder

The invention belongs to the technical field of preparation of strontium titanate and discloses a preparation method of nano-scale strontium titanate powder. The preparation method comprises the following steps: (1) uniformly stirring and mixing 30-40 parts of water, 5-6 parts of concentrated hydrochloric acid and 100-150 parts of absolute ethyl alcohol in parts by volume at a constant temperatureof 25-35 DEG C; (2) uniformly stirring and mixing 35-45 parts of absolute ethyl alcohol and 12-14 parts of tetrabutyl titanate in parts by volume at a constant temperature of 30-40 DEG C, adding strontium carbonate, stirring for 15-25 minutes, carrying out ultrasonic treatment for 40-60 minutes, adding the solution obtained in the step (1), and standing at the room temperature for 3-5 hours in adark environment, wherein the molar ratio of tetrabutyl titanate to strontium carbonate is (0.9-1.0) to (1.0-1.1); and (3) standing, heating and drying the product obtained in the step (2), grinding,and maintaining the tempera