Saline-alkali soil precipitation method and system

A saline-alkali soil precipitation method comprises the following steps that the depth needing precipitation is determined according to the precipitation requirement of a target land parcel; according to the rainfall depth and the terrain and geology of the target land parcel, determining a target aquifer used for salt elimination and located underground the target land parcel; drilling from the earth surface of the target plot to a target aquifer to form a hoistway, inserting a first guide pipe with a permeable hole into the hoistway, injecting a filter material into the first guide pipe, excavating a working pit to the target aquifer, and jacking a second guide pipe into the target aquifer at the position of the target plot through pipe jacking equipment, the pipe wall of the second guide pipe is provided with a water permeable hole for enabling a target aquifer to enter the second guide pipe; a filter material is injected into the second guide pipe, the second guide pipe is filled with the filter material