The present invention provides a method, a device, and a system for notifying a terminal type supported by a current cell, so that a UE can identify the terminal type supported by the current cell as soon as possible. The method includes: carrying preset indication information in a downlink signal, where the indication information is used to indicate the terminal type supported by the current cell, the preset indication information is agreed upon by a network side and a terminal in advance, and the indication information is a synchronization sequence or a first indicator bit used to indicate the supported terminal type; and sending the downlink signal to the terminal.