Embodiments of this application disclose a data transmission method. The data transmission method includes establishing, by a station, a multi-link to an access point, the multi-link instructing the access point to provide at least a first frequency band and a second frequency band, and the first frequency band and the second frequency band being two different frequency bands; transmitting, by the station, a first data packet to the access point on the first frequency band; and transmitting, by the station, a second data packet to the access point on the second frequency band, wherein the access point removes the first data packet or the second data packet according to a data transmission status, the second data packet and the first data packet transmitting same service data.