The invention discloses a talkback and video data transmitting method based on a wireless local area network, and a talkback commutator, which are realized by adopting a plurality of wireless local area network user terminals, a plurality of wireless local area network wireless access stations, a wireless local area network switch and a talkback and video management server, can provide the characteristics of high connection speed, strong instantaneity, high voice quality, and absolute forced prior communication in priority level for talkback and video data transmission of the wireless local area network user terminals under the condition of keeping the prior functions of data access and transmission of the wireless local area network on the basis of an equipment network and external line transmission system provided by the existing wireless local area network equipment, and have functions of general calling, group calling and notification. Meanwhile, during needing, the communication connection between the wireless local area network user terminals and public telephone communication network users can be realized, so that demands on talkback and video data transmission of the wireless local area network user terminals are met.