The invention relates to a double-rotational purification device applicable to an absorption tower. The double-rotational purification device comprises upper-part porous fixing plates, double-rotators, lower-part porous fixing plates and a connecting plate, wherein the upper-part porous fixing plates and the lower-part porous fixing plates are circular porous plates and are used for respectively fixing the upper parts and the lower parts of the double-rotators; the connecting plate is connected with the double-rotators in a horizontal direction; a plurality of double-rotators are connected and fixed as a circular tower disc by the upper-part porous fixing plates, the lower-part porous fixing plates and the connecting plate, and the circular tower disc is mounted on a support beam inside the absorption tower; the circular tower disc is arranged between an inlet of the absorption tower and a spraying system; the double-rotators comprise fixing sleeve rings, inner cylinders, inner cylinder rotational blades, outer cylinders, outer cylinder rotational blades and central cylinders. The double-rotational purification device has the beneficial effects that 1, the dust collection efficiency can be improved, 2, the desulfurization efficiency can be effectively improved, 3, the double-rotational purification device is convenient to operate, small in transformation workload and low in energy consumption, and 4, the system is high in reliability and convenient to overhaul.