The utility model relates to a double -deck agitator tank, including a jar body, the jar is internal to be provided with the (mixing) shaft and to set up at the epaxial agitator of stirring, the (mixing) shaft is provided with its pivoted of drive actuating mechanism, be provided with defoamer on the (mixing) shaft, defoamer includes the first stirring bars who rotates piece and a plurality of quantity, first rotation with (mixing) shaft pivotally connected to, stirring bars's one end with a first rotation fixed connection. The utility model discloses technical scheme has simple structure, stirs the technological effect that reduces the bubble more evenly, more and produce.