The invention relates to a combined atomization type device and method for preparing spherical metal alloy micro powder. The device comprises an induction melting furnace, a tundish, an inert gas pipe for atomization, a gas atomization spray ring, a centrifugal atomization rotating disc, a high-speed motor, a motor protection shell, an atomization chamber shell, a fixed support and a melting operation bin shell. According to the combined atomization type device and method for preparing the spherical metal alloy micro powder, powder prepared through gas atomization and powder prepared through centrifugal atomization are combined to be used together, so that the pressure of gas for gas atomization and the rotating speed of the centrifugal atomization rotating disc are decreased, the operation difficulty in the manufacturing and production processes of the device is substantially lowered, mass production is achieved, and the prepared metal alloy micro powder meets the specification and requirements of 3D printing for the metal alloy micro powder; and particularly, the method provided by the invention has the advantages that a metal alloy micro powder product is narrow in particle size distribution and good in controllability, the degree of sphericity is significantly improved, the oxygen content is substantially reduced, and meanwhile, the equipment investment and production operation cost are reduced.