The invention relates to a clustered type layered rainfall no-filler pipe tamping system for a soft foundation. The clustered type layered rainfall no-filler pipe tamping system for the soft foundation is characterized by comprising a plurality of clustered type layered rainfall well points and branch pipes, wherein the clustered type layered rainfall well points are arranged in an array, and the branch pipes are used for being connected to the multiple clustered type layered rainfall well points; the branch pipes are connected to a main pipe, and the main pipe is connected to vacuum pumps; the clustered type layered rainfall well points comprises a plurality of layered well points arranged in a well hole; the multiple layered well points are arranged according to different layer thicknesses; each layered well point is according to the burying layer thickness of soil, and the same layered well points serve as a loop; the branch pipes are connected to the various layered well points with the same layer thickness through a tee joint; and each vacuum pump is connected to the layered well points with the same layer thickness. The clustered type layered rainfall no-filler pipe tamping system and a construction method thereof for the soft foundation have the advantages that the construction procedure is simple, the construction period is short, the cost is low, and by means of the deep-to-shallow method, the characteristic value of the bearing capacity of the foundation soil in the required reinforcing range can be increased many times.