Automatic watering method and system for smart community

The invention discloses an automatic watering method and system for a smart community. The method comprises the steps that a controller obtains soil humidity information from each sensor node; the controller determines a target sensor node from the at least one sensor node, and the target sensor node is a sensor node of which the acquired soil humidity information is smaller than a threshold value; the controller acquires first weather forecast data in a future period of time and predicts rainfall in the future period of time according to the first weather forecast data; the controller determines the watering amount according to the predicted rainfall; and the controller sends a starting signal including the watering amount to a target watering assembly so as to control the target wateringassembly to water plants in an area where the target watering assembly is located according to the watering amount, and the target watering assembly is a watering assembly corresponding to the targetsensor node. The watering