The utility model discloses an automatic water replenishing device for
psidium guajava planting in
saline-
alkali soil, and particularly relates to the technical field of
saline-
alkali soil water replenishing. The automatic water replenishing device comprises a water tank, a bottom plate is fixedly arranged at the bottom of the water tank, an upper cover is arranged at the top of the water tank, a water suction pump is fixedly arranged on one side of the top of the bottom plate, and a water inlet of the water suction pump is fixedly communicated with a water inlet
pipe; one end of the water outlet
pipe is fixedly communicated with a first connecting
pipe, one side of the first connecting pipe is fixedly communicated with a plurality of second connecting pipes, the tops of the second connecting pipes are fixedly communicated with a plurality of nozzles, and the outside of the first connecting pipe is connected with a plurality of soil
moisture detectors through a support. Impurities in a
water source can be filtered through the filter screen, the impurities in the
water source can be prevented from blocking the water suction pump or the spray head, the service life of the water tank is prolonged, the connecting plate can be pulled out from the interior of the water tank through the filter mechanism, the impurities on the filter screen are cleaned, and the impurities are prevented from blocking the filter screen.