Abstract: In order to improve the efficiency of water use in large paddy fields, increase rice production and establish an intelligent irrigation control system for large paddy fields, an intelligent irrigation control system for paddy fields is designed with the STC15F2K60S2 as the main control chip, combining IoT and sensor technology. The system has three different modes of intelligent irrigation control: economic water irrigation, shallow wet sun irrigation and rice-fishery irrigation, which can be set up according to different usage environments. The system can collect water temperature, water level, soil water content and other parameters in the paddy field using field terminal sensors to improve the economic and ecological benefits. The data collected by the system can be uploaded to the cloud database via wireless network for remote control center or user’s intelligent terminal software to call. Field trials in the Agricultural Science and Technology Park in Anda, Heilongjiang Province, have shown that the intelligent irrigation control system can remotely monitor the real-time situation of large blocks of paddy fields and quickly respond to operational instructions, achieving water-saving control of irrigation to improve economic efficiency.