The invention relates to the technical field of environmental protection equipment, and in particular to an efficient desulfurizing tower. The efficient desulfurizing tower comprises a tower body, wherein a smoke outlet is formed in the top part of the tower body; the tower body is internally provided with multiple stages of spraying systems; multiple demisting and dedusting devices are arranged at the lower part of each stage of spraying system; the multiple demisting and dedusting devices are arranged in parallel or in series; the tower body is also internally provided with a row of smoke outlet demisting and dedusting devices; the smoke outlet demisting and dedusting devices are arranged near the smoke outlet; each of the demisting and dedusting devices and the smoke outlet demisting and dedusting devices comprises a shell, rotational flow plates are respectively arranged on the upper end and the bottom end of the shell, the rotational flow plates comprise rotational flow blades, and rotation directions of the rotational flow blades of the two rotational flow plates are opposite; the smoke outlet is connected with a smoke and dust purifier. The efficient desulfurizing tower disclosed by the invention is simple in structure and high in water mist removing rate.