The invention discloses an atomization synthesizer which comprises a reaction kettle (11) with a stirring device (12), a high-position visible water storage tank (10), a liquid flowmeter (8), an atomizer (9), a water inlet pipe (5), a central gas inlet pipe (6) and a peripheral gas inlet pipe (7), wherein the atomizer (9) is mainly composed of a central barrel (9-b), an outer barrel (9-a) and an annular nozzle (9-c); the outer barrel (9-a) is in an cylindrical / inverted V-shaped round table composite structure, and the length-to-diameter ratio is 8-10 on the basis of the diameter of the cylindrical part; the central barrel (9-b) and outer barrel (9-a) are coaxial and concentric, the central barrel (9-b) and the cylindrical part of the outer barrel (9-a) are of the same height, the bottom end of the central barrel (9-b) is closed, and the length-to-diameter ratio of the central barrel (9-b) is 8-10; the side wall on the middle and lower parts of the central barrel (9-b) is uniformly distributed with pinholes (9-d), wherein the density of the pinholes is 1-2 / mm<2>, and the sizes of the pinholes are 0.4-0.6mm; the bottom end of the outer barrel (9-a) is provided with the annular nozzle (9-c) which has the same diameter as the central barrel, and the clearances of the pinholes in the annular nozzle are 0.5-0.8mm; the water inlet pipe (5) and central gas inlet pipe (6) are inserted into the central barrel (9-b); and the peripheral gas inlet pipe (7) is connected between the outer barrel (9-a) and the central barrel (9-b). The atomization synthesizer has the advantages of controllable pressure, favorable water atomization effect and low cost, is safe and easy for operation, can be well applied to direct hydrosynthesis reaction of alkylaluminoxane, and greatly increases the yield of alkylaluminoxane as compared with the indirect hydrosynthesis technique.