In order to solve the grooving construction of underground continuous wall passing through underground pipeline, the method of readjusting the width of the ground connecting wall passing through the pipeline is studied to form a ground connecting wall, grab the soil and form a groove in three sequences, and the rock stratum at the bottom of the groove is broken by punching pile machine in two sections bounded by the pipeline. Special transformation is made for the reinforcement cage to form two forms of "fish head cage" and "fish tail cage". The installation and construction of reinforcement cage of a diaphragm wall is completed by inserting and butting into the groove, which could avoids the potential safety hazard of foundation pit support leakage after excavation, reduce the cost of problem solving and reduces the difficulty of problem handling.