A liquid column type exhaust gas treatment apparatus comprising a spray header (2) for injecting an absorbing solution upward in an absorption tower (1), wherein exhaust gas introduced from a lower part of the absorption tower (1) and the absorbing solution injected from the spray header (2) are brought into gas-liquid contact with each other, by which desulfurization of exhaust gas is accomplished, characterized in that drift preventing plates (5a and 5b) are provided in a liquid top portion of a liquid column (6) formed by the absorbing solution and/or at the installation position of the spray header (2).