Network access method, device and system

The embodiment of the invention provides a network access method, a network access device and a network access system, which are used for avoiding the situation that a certain type of terminal equipment is interfered by other types of terminal equipment and cannot normally access a cell managed by a corresponding type of network equipment. The method comprises: a terminal device receives a first message from a network device; wherein the first message is used for indicating whether one type of terminal equipment in the at least two types of terminal equipment is allowed to access the network equipment or not, and the at least two types of terminal equipment comprise terminal equipment of a gateway station type and terminal equipment of a common non-ground communication network NTN terminal type; and the terminal device determines whether to initiate a process of accessing the network device according to the type of the terminal device and the first message.