Abstract: An ozone reaction apparatus comprises an outer vessel 1 having an inlet 2, an exit 3 and a treated water drain port 4 each attached to a lower portion thereof, an inner vessel 5 disposed in the outer vessel 1 having an inlet connection pipe 6 and an exit connection pipe 7 each attached to a lower portion thereof, in which the flow inlet 2 is connected with the inlet connection pipe 6 and the exit 3 is connected with the exit connection pipe 7. A stirring device 8 is provided to the fluid inlet side of the inlet 2 in which the exit 3 and the stirring device 8 are connected by way of a suction pipe 9, a circulation pump 10 and an exit pipe 11, the suction pipe 9 is connected with a raw water inlet pipe 12 and the exit pipe 11 is connected with a gas supply pipe 13 of an ozone generation device. A partitioning control ring disc 14 is attached coaxially to the inner vessel 2. The stirring device 8 comprises a flow deflection structure and an ozone reaction zone disposed at the downstream thereof.