In engineering construction, soft soil foundations are common. Their characteristics of high water content, high compressibility, and low bearing capacity pose a serious threat to the stability and safety of buildings. To ensure the normal use of the superstructure, effective foundation reinforcement measures are essential. The cement-soil mixing pile technology forms a composite foundation with good strength and stability by forcibly mixing cement and foundation soil. It is outstanding in enhancing soil strength, reducing compressibility, and improving overall stiffness, and is widely used in engineering practice. This article starts from the principle of this technology and deeply explores its application and innovative ideas in soft soil foundation reinforcement, aiming to provide a reference for similar projects.