Nano tantalum powder is produced by a variable current laser ion beam gas phase process, with high purity, uniform particle size, complete surface structure, easy dispersion, large specific surface area, and high surface activity. The density of nano tantalum powder is 16.5g/cm3, and the melting point is 2800 degrees. Tantalum capacitors are capacitor products used in the field of military electronics. The size of electronic products has become smaller and smaller, requiring the development of tantalum capacitors in the direction of miniaturization and high capacity. The specific capacity of micron tantalum powder is closely related to the particle size density. The smaller the size, the larger the specific capacity. Therefore, the preparation of nano-tantalum powder promotes the development of tantalum capacitors.