The invention provides a centrifugal atomizing device for preparing metal powder. An atomizing tank is connected with a ground wire, a material storage bin is arranged on the atomizing tank, and a metal wire is connected with a direct-current power supply through the material storage bin; the upper portion of the interior of the atomizing tank is provided with a rolling wheel straightener; a centrifugation device is arranged under the straightener; the centrifugation device is provided with a rotating plate for sensing heating, the axis of the rotating plate coincides with that of the metal wire, the rotating plate is connected with a steering speed reducer through a support shaft, the steering speed reducer is connected with a high-speed motor outside the tank through a magnetic fluid sealing device, and the atomizing tank is provided with a powder collecting device. When the device is used for preparing the metal powder, the metal wire is molten in the vacuum atomizing tank and does not make contact with air, molten metal is prevented from being oxidized, and the metal utilization rate is high; the molten metal does not make contact with a fireproof material, non-metallic inclusion pollution is avoided, and the high-purity metal powder can be produced; the shape and size of the metal powder particles are easy to control, the powder particles of which the shape is similar to a ball and the size distribution range is narrow can be abtained, and the device is particularly suitable for 3D printing.