Fuente: Wipo "IOT" The utility model relates to the technical field of Internet of Things. The utility model relates to a linkage system, in particular to an equipment linkage system based on an IOT cloud platform. Thesystem comprises an IOT cloud platform, the IOT cloud platform is in communication connection with a user terminal and an SaaS service cloud platform for data transmission, the IOT cloud platform is in control connection with IOT equipment, the IOT cloud platform is connected with a third-party server, and the third-party server is in communication connection with the user terminal. According to the utility model, on the premise that an IOT cloud platform and IOT equipment are not changed, a linkage function comparable with a Zigbee network or a Bluetooth Mesh network can be realized. Meanwhile, automatic linkage between the IOT devices of the same type and between the IOT devices of different types can be achieved.