Disclosed in an embodiment of the invention are a method and device for transmitting a trigger frame in a wireless local area network. The method for transmitting a trigger frame in a wireless local area network comprises: generating, by an access point, a trigger frame carrying a target media access control (MAC) function, wherein the trigger frame comprises instruction information used to instruct a first station to transmit a MAC frame corresponding to the target MAC function and to instruct a second station to not execute the target MAC function; and transmitting the trigger frame by the access point. The invention uses the instruction information to instruct the first station to transmit the MAC frame corresponding to the target MAC function without imposing restriction on the second station, thereby flexibly controlling data transmission of the first station and the second station.
