A smart agricultural automatic feeding device includes a feeding box, a weighing part is disposed in the feeding box and connected with a top of the feeding box; a separating part is disposed below the weighing part and rotatably connected to an inner wall of the feeding box, a feed end of the separating part is connected with a discharge end of weighing part; a delivery part is disposed below the separating part and includes delivery tubes arranged in parallel, the delivery tubes are fixed to the inner wall of the feeding box, feed ends of the delivery tubes are connected to the discharge end of the separating part and configured to be arranged correspondingly to a fish pond; an air supply part is disposed outside the feeding box and connected to the delivery tubes through a pressurized part, the pressurized part is in transmission connection with the separating part.