The invention discloses a micro-power-consumption automatic irrigation control system, which comprises: a plurality of sensor modules for collecting farmland parameter information, pipeline data and air data information and wirelessly transmitting; a sensor interface module wirelessly connected to the plurality of the sensor modules and used for receiving and converting the data transmitted by thesensor modules; a main control module comprising a storage area, and used for storing the data transmitted by the sensor modules through the sensor interface module, making water demand diagnosis according to the stored data information transmitted by the sensor interface module, and making a corresponding command according to the water demand diagnosis; and a plurality of execution modules for receiving the command transmitted by the main control module, and executing. According to the present invention, the micro-power-consumption automatic irrigation control system is based on the wirelessnetwork, can be subjected to real-time remote monitoring, is electrified by solar energy so as to achieve advantages of energy saving and environmental protection, and further can automatically control and precisely water.