The invention discloses a high-resolution radiation coefficient detection method. The method comprises: laying electrodes in an equidistance incremental mode, the depths of the electrodes being arranged in an equal-depth incremental mode in the same way; fixing an MN apparatus; employing a maximum electrode distance of AB/2(max)=1.3H; performing difference operation by means of a neighboring electrode distance and an apparent resistivity value to obtain an apparent reflection coefficient KS and a reciprocal KD of the apparent reflection coefficient.