OTA upgrading system, OTA upgrading method and intelligent gateway

The invention belongs to the technical field of Internet of Things, and particularly relates to an OTA upgrading system, an OTA upgrading method and an intelligent gateway. The OTA upgrading system comprises zero or one management platform and at least one intelligent device, and is characterized in that the intelligent devices are configured into different device types and can be subjected to device type conversion, and the device types comprise management nodes and device nodes; the management node accepts self-registration of the equipment node and provides OTA upgrading service for the equipment node registered in the management node; the management node can be used as a device node to automatically register to other management nodes or the management platform and obtain an upgrade package; and the device node registers on a management node or a management platform by itself, and obtains an upgrade package from the management node or the management platform. The invention provides a demand-driven flexible