Concealed pipe reverse salt elimination method for saline-alkali soil improvement

The invention discloses a concealed pipe reverse salt elimination method for saline-alkali soil improvement, which comprises the following steps: burying a pipeline, a water content sensor and a salt content sensor below a soil layer to be improved, controlling a water pump to inject water into the pipeline through a control system, and feeding back a numerical value to the control system through the water content sensor and the salt content sensor; the amount of injected water is controlled; a circulating water injection mode is adopted until the salt content value under the required standard is reached; and after the last water injection operation is completed and the surface layer of the soil layer is dried in the sun, uniformly collecting the soil salt formed on the surface layer of the soil layer. Compared with the prior art, the method has the beneficial effects that the salt below the soil layer is reversely discharged to the earth surface in a reverse salt discharging manner, so that direct unified tr