PROBLEM TO BE SOLVED: To provide an automatic irrigation water cut-off apparatus which has a simple structure and is easily portable.SOLUTION: An automatic irrigation water cut-off apparatus has: a sensor part 12 which detects a water level of a crop land C a shutter part 13 for cutting off introduction of water from an irrigation channel A to the crop land C a drive part 14 which activates the shutter part, in a freely separable manner, in which the sensor part has a microswitch which detects a predetermined water level of the crop land to activate the drive part, the shutter part has a shutter plate which closes a water inlet connecting the irrigation channel and the crop land by falling by its own weight, the drive part has a holding member which is freely attached to and detachable from a crop land side of the shutter part and holds the shutter plate in the state where the water inlet is open during introduction of water from the irrigation channel to the crop land, and the holding member is configured such that the shutter plate is allowed to fall by its own weight to cut off introduction of water from the irrigation channel to the crop land in the case where the sensor part detects the predetermined water level.SELECTED DRAWING: Figure 1
