The invention provides a device and method for preparing superfine spherical metal powder by a dropwise centrifugal atomization method. The device comprises a shell body, a crucible and a powder collection area. The crucible and the powder collection area are arranged in the shell body. The device is characterized in that a rotating disc arranged in the powder collection area is of a mosaic structure, a material with poor thermal conductivity is selected as the base body part of the rotating disc, metal materials which have a wetting angle with a drop being less than 90 degrees are selected tobe inlaid in a main body part to serve as an atomization surface of the rotating disc, and a ventilating hole is formed in the rotating disc. The method for preparing the superfine spherical metal powder through the dropwise centrifugal atomization method is disclosed, a uniform droplet injection method and the centrifugal atomization method are mainly combined, a traditional metal division pattern is broken, molten metal shows fibrous division so that the superfine spherical metal powder which has a narrow distribution section of a grain size, high sphericity, good liquidity, good spreadingability, an uniform and controllable size and no satellite droplet can be efficiently prepared, and the method is suitable for industrial production.