Fecha de publicación: 26/12/2018 Fuente: Wipo "IOT" Embodiments of the present invention provide an access method, a device, and a system, and are applied to the communications field, to implement access of an IoT gateway with no requirement for a version of the IoT gateway, and reduce IoT cloud platform resources. A specific solution includes: UE on which an MAPP is installed and a to-be-connected IoT gateway access a same local area network, so that the UE obtains an address of the to-be-connected IoT gateway. An IoT cloud platform allocates, to the MAPP installed on the UE, a unique access identifier corresponding to the MAPP. The UE provides an address of the IoT cloud platform and the allocated access identifier for the IoT gateway whose address is already learned. The IoT gateway adds the access identifier to a registration message, and sends the registration message to the IoT cloud platform. The IoT cloud platform binds the IoT gateway sending the registration message to the MAPP corresponding to the access identifier included in the registration message,, so as to complete access of the IoT gateway. The present invention is used for performing access of the IoT gateway.