The invention discloses a method for predicting the forced self-suction amount of shale organic matter. The method comprises the following steps that basic characteristic parameters of the shale organic matter are collected according to on-site rock core experimental data; a circular tube flow equation with slip in a shale organic matter capillary tube is established; an even capillary tube bundleself-suction model under the effect of capillary force is established; and an arbitrary-shape capillary tube forced self-suction model of the shale organic matter is established. According to the method, the influence of the factors such as non-circular characteristics of the actual organic matter capillary tube is considered, a fractal theory is combined, thus the shale organic matter self-suction predicting model which comprehensively considers the shale organic matter pore size fractal characteristic, the pore channel tortuosity, the slip effect and forced self-suction force is established, and through combination of experiments and the theory, the factors are considered more comprehensively.