The present invention relates to a new automatic irrigation device capable of efficiently supplying a large amount of water to a remote place. An automatic watering apparatus according to the present invention includes a water tank 10 in which water is stored and water supply means connected to the water tank 10 to supply water stored in the water tank 10 to the spray nozzle 1 And a supply unit 30 connected to the water supply unit 20. The water supply unit 20 includes a support frame 21 and a support frame 21 extending laterally from the support frame 21, The first connection part 22a is connected to the front end of the connecting pipe 22 and the air supply control valve 23a is provided at the middle part of the connecting pipe 22a. A water supply pipe 24 whose front end portion is connected to the second connection portion 22b and an inlet port which is connected to the water tank 10 through an absorption pipe 25a The water outlet pipe is connected to the water supply pipe 24 and sucks the water stored in the water tank 10 and supplies the water to the water supply pipe 24. A water pump 25 and an exhaust pipe 26 connected to the third connection portion 22c and having a plurality of branch pipes 26a, 26b, 26c and 26d at an intermediate portion thereof, 26c and 26d and a discharge control valve 27 provided in the discharge control valves 23a, 23c and 26d for opening and closing the branches 26a, 26b, 26c and 26d, The branch pipes 26a, 26b, 26c and 26d are connected to the injection nozzle 1 and the like through a supply pipe 26e and are connected to the feed pump 25, When the supply control valve 23a is opened and the discharge control valve 27 is opened, the water supplied by the water supply pump 25 is supplied to the high pressure The air is supplied to the injection nozzle 1, Therefore, it is possible to prevent the flow rate and the pressure of the water supplied to the injection nozzle 1 from being lowered due to the resistance generated when the water passe
