Method for online cleaning structured packing of absorption tower of hydrochloric acid regeneration system

The invention discloses a method for online cleaning structured packing of an absorption tower of a hydrochloric acid regeneration system. The system comprises the absorption tower, wherein the top of the absorption tower is provided with an absorption tower spraying device, the bottom of the absorption tower is provided with a manhole cover, and is connected with a regenerated acid tank through a first pipeline, the regenerated acid tank is connected with a Venturi scrubbing tower through a second pipeline, and a Venturi scrubbing tower spraying device is installed at the top of the Venturi scrubbing tower; and the second pipeline is sequentially connected with a first re-acidification pump, a first valve and a second valve in series, and the absorption tower spraying device is connected between the first valve and the second valve through a third pipeline. The cleaning method comprises the following steps: opening the first valve, closing the second valve, and starting the first re-acidification pump to con