The invention relates to a blockage-removing method for polymer flooding blocking wells, and belongs to the field of fracturing reformation of oil wells. The blockage-removing method includes the steps of conducting fracturing construction to an blocked oil layer caused by polymer injection and controlling the length of an artificial fracture to 40-60 m, and the height to no more than 20 m, specifically, the fracturing construction is small-scale fracturing construction by sequentially injecting stratum treating fluid with a volume of 10-35 m3, injecting ahead fluid with a volume of 10-30m3, injecting particle loaded fluid with a volume of 40-60 m3, and injecting displacing fluid with a volume of 8-16m3. By reasonable selection of the polymer flooding to block wells, the pertinency and effectiveness of subsequent fracturing measure reformation are improved; by control of the length and the height of the artificial fracture, not only the permeability of a polymer blocked oil layer in near bore zones and effectiveness of the measures are improved, but also wastes of materials and labor cost caused by an excessive large construction scale are avoided, the validity of fracturing blockage-removing measures is increasingly prolonged, and the reservoir recovery is improved.