The invention discloses a device for preparing superfine spherical high-melt-point metal powder for 3D printing. The device comprises a shell, a crucible disposed in the shell and a collecting bin disposed on the lower portion of the shell. The device is characterized in that a thermal coupler is disposed inside the crucible, and a heating band is disposed outside the crucible; the collecting bin is fixed with the shell through a support, an annular descending pipe is disposed between the shell and the collecting bin, a centrifugal plate is disposed at a position, which is opposite to the lower end of the annular descending pipe, in a collecting bin cavity, the centrifugal plate is supported by a support column, and a collecting groove is formed in the bottom of the collecting bin. The invention further discloses a method for preparing the superfine spherical high-melt-point metal powder for 3D printing. The method combines a pulse micro-pore injection method and a centrifugal atomizing method. The method and the device have the advantages that the high-melt-point metal powder satisfying requirements can be prepared efficiently, and the prepared metal power is controllable in particle size, narrow in particle size distribution interval, high in sphericity, free of satellite droplet, good in flowability and spreading property, high in production efficiency, low in cost and suitable for industrial production.