Abstract: Intelligent irrigation is one of the main ways to improve the efficiency of agricultural irrigation. An intelligent irrigation system based on Android system and MCU was designed to solve the problems of intelligent monitoring and remote control in agricultural irrigation in this paper.The system was mainly included the upper computer Android mobile APP, the lower computer and the cloud service platform. The upper computer was adopted HTML5+ CSS+ JavaScript to implement the mobile application in the API Cloud Studio environment; The lower computer was applied the STM32 F411 processor as the core CPU of the intelligent irrigation system. The IoT cloud platform was used to realize the communication between the upper computer and the lower computer, and the speed of the membrane pump irrigation was controlled by Pulse Width Modulation.Users could monitor environmental information and crop growth status in real time through mobile phones, set irrigation mode and control irrigation start-up and speed. It can be shown through system tests that the system is operated normally and reliably and has certain practical value in agricultural remote intelligent monitoring and irrigation.