Concealed pipe reverse salt discharging device

The utility model discloses a concealed pipe reverse salt discharging device which comprises a main pipe, a branch pipe, a capillary pipe, a water pumping pipe, a water content sensor, a salt content sensor and a control system, wherein the main pipe is horizontally buried under the earth surface; the branch pipes are horizontally arranged on the main pipe and evenly distributed, and electric control valves are arranged at the joints of the main pipe and the branch pipes. The capillary tubes are located between the adjacent branch tubes, and water outlet holes are formed in the capillary tubes. The water pumping pipe is connected with the main pipe, a water pump is arranged at the outer end of the water pumping pipe, and a flowmeter and a pressure gauge are arranged on the water pumping pipe; the water content sensor and the salinity sensor are buried under the earth surface; the control system is respectively connected with the electric control valve, the water pump, the flowmeter, the pressure gauge, the wa