The chain knife underground diaphragm wall forming machine is a powerful tool for underground foundation construction, widely applied in various projects such as construction and revetment works. It mixes the original soil and injects grout through chain saw cutters to form continuous, flat, and uniformly thick walls. These walls exhibit excellent water-stopping performance, with a permeability coefficient of up to 1×10⁻⁷ cm/s or even lower. Paired with high-precision inclinometers, it ensures that the verticality error is ≤1/250.