The utility model provides a mechanical water plugging tubular column arranged in a casing tube. The mechanical water plugging tubular column comprises an outer layer tubular column body and an inner layer tubular column body. The outer layer tubular column body comprises an x-over screen tube, a first packer, an outer layer oil tube and a second packer which are sequentially connected from top to bottom. Through holes are formed in the side walls of the x-over screen tube. The inner layer oil tube penetrates into the outer layer tubular column body. An annular space communicated with the through hole is formed between the inner layer oil tube and the outer layer tubular column body. The annulus, above the first packer, of the casing tube is an upper casing tube annulus, the annulus, below the second packer, of the casing tube is a lower casing tube annulus, the annular space and the through holes form a flow passageway between the upper casing tube annulus and the lower casing tube annulus, shaft bottom gas can enter the upper casing tube annulus through the flow passageway and then is exhausted, well flushing, paraffin removal and other conventional production are conducted through the flow passageway, and the production problems of gas locking, paraffin precipitation, non flushing and the like frequently occurring to a light oil well are effectively solved.