The invention provides an experimental determination method for the passing capability of polymer gel grains in a porous medium. The method comprises the following steps: measuring a relation curve of the absorbance and the concentration of a polymer gel grain standard solution; determining a change relation curve of passing factors of the polymer gel grains along with pressure under different permeation rates; determining a change relation curve of the passing factors of the polymer gel grains along with the pressure under different injection concentrations; determining a starting pressure of the polymer gel grains and a passing pressure of the polymer gel grains; and obtaining a polymer gel grain passing factor chart according to the curves, the starting pressure of the polymer gel grains and the passing pressure of the polymer gel grains in the step 1 and the step 4. The experimental determination method for the passing capability of the polymer gel grains in the porous medium provides experimental evidences for establishing a heterogeneous combination flooding numerical simulation method and quantitatively characterizing a displacement mechanism.