Abstract: In order to monitor soil moisture in real time，an intelligent irrigation system based on Internet of Things technology was designed through Wi-Fi technology，soil moisture sensor，Arduino Uno microprocessor and Web server.Hardware system with soil moisture sensor and Arduino Uno microprocessor as the core was built，and software design was completed by writing JSP program in Java language.Through experiment，the system could monitor soil moisture in real time.When measured data was less than the set threshold value，irrigation equipment would be opened automatically to adjust soil moisture intelligently.Using this method，simple circuit could complete complex functions，greatly reduce design cost，and was suitable for occasion of real-time monitoring of soil moisture.