The invention provides an imbibition drainage method. The method involves the process that in order to treat a rising soil disaster of a track bed of a railway ballast track, a dredging method is used, a drainage system in a rising soil section is partially reconstructed, and the capillary action of water in a track bed body and the imbibition function of a drainage material are used for organically guiding saturated water in the track bed out of a roadbed. The method is specifically implemented through the steps that firstly, a blind ditch which is at a certain depth and in the same direction as sleepers is formed between the sleepers at the rising soil position, a layer of water collecting sand bed is laid at the bottom of the blind ditch, due to the funneling effect of the blind ditch, the saturated water in the track bed rapidly seeps into the water collecting sand bed, and water, soil and residues are rapidly separated; and then water is rapidly separated from the sand bed and continuously drained to a side ditch through an imbibition drainage pipe embedded in the water collecting sand bed, and therefore the purpose that the saturated water in the track bed is guided out of the roadbed is achieved. By the adoption of the method, water is drained through three steps, a drainage system is not clogged, and the method has the beneficial effects that water is actively sucked and drained, no rock ballast soil flows away, safety and reliability are achieved, and the rising soil disaster of the track bed can be effectively treated.