A wireless local area network data frame transmission method and apparatus. The wireless local area network data frame transmission method includes determining a current transmission rate of a data frame as a first transmission rate; when a size of the data frame is less than a preset threshold, adjusting the current transmission rate of the data frame to a second transmission rate, where the second transmission rate is less than the first transmission rate, and transmitting the data frame at the second transmission rate. By means of the embodiments of the present disclosure, noises existing in a voice obtained by means of decoding by a receiving party can be avoided in a manner of reducing a voice data frame transmission rate.