The invention relates to a hollow microbead spheroidizing device. The hollow microbead spheroidizing device comprises a spheroidizing chamber (1), wherein a solution tank (2) is formed in inner upper surface of the spheroidizing chamber; an outlet (2a) is formed in the lower surface of the solution tank; a melted solution (4) and an air inlet pipe (3) are also arranged in the solution tank; a collector (13) is in matching connection at one side of the spheroidizing chamber. The hollow microbead spheroidizing device is characterized in that a rotating shaft (7) is vertically connected into the spheroidizing chamber; a cutter (8) and a motor (14) are connected to the upper end and the lower end of the rotating shaft, respectively. The hollow microbead spheroidizing device further comprises a side air source (10) and a lower air source (11), wherein the side air source and the lower air source are respectively connected with a side air port (5) and a lower air port (6) which are arranged on the sidewall of the spheroidizing chamber in a penetrating manner. The hollow microbead spheroidizing device has the advantages that large-diameter hollow microbeads can be spheroidized well during preparation, therefore, the hollow microbeads have the characteristics of being uniform in inner wall and uniform in compressive strength, the physical performance of the hollow microbeads is also greatly improved, and the application field of the hollow microbeads is expanded.