Wireless local area network data transmission method and device

An HE-LTF transmission method, comprising: the total number N STS of space-time streams determining the number N HELTF of OFDM symbols contained in an HE-LTF domain; a transmission bandwidth and an HE-LTF mode determining an HE-LTF frequency domain sequence; the HE-LTF frequency domain sequence comprising, but being not limited to, an HE-LTF mode sequence under a 1x mode mentioned in the embodiment; and sending a time domain signal according to the number N HELTF of the OFDM symbols and the determined HELTF frequency domain sequence. The above solution has a relatively low PAPR value.