The invention relates to the field of oilfield chemistry, and belongs to a method for plugging a preferential seepage channel after polymer flooding for an oil field. The situation that middle-low permeable layers are damaged while the preferential seepage channel is plugged through an existing plugging method is effectively avoided, and the problem of hard deep fixed-point plugging after polymerflooding is solved. Firstly, a low-initial-adhesive controllable gel plugging control agent is prepared; the prepared plugging control agent is divided into four slugs to be injected into a stratum; and the natural selection function of the low-initial-adhesive controllable gel plugging control agent is utilized to achieve the effects that the plugging control agent selectively enters a high-permeability layer section required to be plugged and does not enter or less enters middle-low permeable stratums which do not need to be plugged, and thus fixed-position and fixed-point plugging control is achieved. The method has the advantages that only the preferential seepage channel is plugged, the number of profile control slugs is decreased, and the profile control construction process is simplified.