The invention relates to the technical field of hydraulic fill soil improvement through using a straw pile, in particular to a method realizing drainage and consolidation of hydraulic fill soil as well as soil mass improvement through utilizing the straw pile. The method comprises the following steps that the straw pile is pressed into the hydraulic fill soil, wherein the diameter of a straw piletop is larger than that of a straw pile body, the contact between the hydraulic fill soil and the straw pile body can be delayed when the straw pile is pressed, and the resistance is reduced; an anti-pressure pile core is drawn out, wherein the anti-pressure pile core is made of a steel pipe, and the anti-pressure pile core can be drawn out and recycled from the straw pile body after pile pressingis finished; the straw pile can form a hollow straw drainage cavity by utilizing good permeability, abilities to degrade fiber cloth, water permeability and slurry-blocking property of straw, whereinan inner lining ring is arranged in the straw pile body, so that the straw pile body after being subjected to pressing of the hydraulic fill soil is prevented from collapsing towards the hollow cavity, the blockage is avoided, and water is conveniently discharged from the hollow cavity; and a drainage pipe is inserted into the straw pile body at regular intervals for drainage so that the hydraulic fill soil can be consolidated. According to the method, the pile top can be slowly decomposed and the straw pile body can be decayed and degraded, organic matter of the hydraulic fill soil can be increased, and the looseness, water permeability and air permeability of the local hydraulic fill soil can be improved. s