The invention discloses a testing method of a liquid producing profile of a horizontal well. The testing method sequentially comprises the following steps: placing a horizontal well of tubular column well completion staged fracturing production to remove a driving sliding sleeve inner ball seat through drilling milling of the horizontal well, releasing a sampling tubular column, swabbing, dragging, re-swabbing to take a liquid produced by each to-be-tested stage in a to-be-tested layer of the horizontal well, metering according to a liquid producing amount of the produced liquid, accurately testing a water content, analyzing a liquid producing characteristic of the to-be-tested section corresponding to the output so as to realize staged swabbing of the to-be-tested layer and improve the swabbing pressure of single-time swabbing as well as achieve the testing of the liquid producing profile of the horizontal pumping well with low yield. Meanwhile, in the whole swabbing process, the to-be-tested sections corresponding to all sections of driving sliding sleeve device are swabbed through the sampling tubular column; the sampling tubular column is simple in structure and convenient to use, therefore, the cost of testing the whole liquid producing profile is reduced, and a technical support is provided for testing and governing of the liquid producing profile of the high-water-content horizontal well in an oil field.