The invention discloses an irrigation system based on cloud computing of the Internet of Things, including: cloud server, mobile terminal, intelligent gateway, router node and monitoring and control module, the monitoring and control module includes MCU, dust concentration sensor, illuminance sensor, humidity sensor , temperature sensor, infrared sensor and ZigBee terminal node, intelligent gateway includes coordinator node, ARM processor and communication module; dust concentration sensor, illuminance sensor, humidity sensor, temperature sensor, infrared sensor are respectively connected with ZigBee terminal node, ZigBee terminal node Connect with the MCU, the coordinator node and the communication module are connected with the ARM processor respectively, the MCU is connected with the router node through the ZigBee terminal node, the router node is connected with the coordinator node, and the ARM processor is connected with the cloud server through the communication module, The mobile terminal communicates with the cloud server.