Construction method of upside-down well wall connected in underground dense pipeline group

The invention discloses a construction method of an upside-down hanging well wall connected in an underground dense pipeline group, and belongs to the technical field of trench construction. The contraction method can monitor the water pressure in a rainwater pipeline in real time, when the water pressure in the rainwater pipeline is increased to a certain degree, a first alarm device can give an alarm, and a blocking air bag is prevented from being extruded out of the rainwater pipeline to cause sewage accumulation. Besides, a Larsen sheet pile anti-inclination device is arranged, whether a Larsen sheet pile inclines or not during jumping driving is monitored through a gravity sensor, when the Larsen sheet pile slightly inclines, an alarm can be given for reminding, and therefore, the Larsen sheet pile is calibrated; and meanwhile, an inner support of the Larsen sheet pile is arranged in a net shape and has good stability, the mode by which rigid supporting and flexible supporting are combined is adopted, an