A data transmission method, wherein the method comprises: generating, by a transmit end, a data packet; and sending, by the transmit end, the data packet to a receive end, wherein the data packet comprises at least two pieces of video service data having different priorities, and the pieces of video service data having different priorities are carried on different communications resources for transmission; wherein a preamble in the data packet comprises indication information of the different communications resources, and the indication information is used to indicate video service data carried on a corresponding communications resource, wherein that the pieces of video service data having different priorities are carried on different communications resources for transmission comprises: based on a correspondence between a communications resource and a priority of video service data, the pieces of video service data having different priorities are carried on different communications resources for transmission, wherein the correspondence between a communications resource and a priority of video service data is determined based on feedback information of the receive end; and the feedback information comprises a plurality of indication bits, one of the plurality of indication bits corresponds to one of a plurality of frequency bands, and the one indication bit is used to indicate a correspondence that is between an antenna and a priority of video service data and that is on the one frequency band; or the feedback information comprises one indication bit, and the indication bit is used to indicate a correspondence between an antenna and a priority of video service data. generating, by a transmit end, a data packet; and sending, by the transmit end, the data packet to a receive end, wherein the data packet comprises at least two pieces of video service data having different priorities, and the pieces of video service data having different priorities are carried on different communications resources for transmission; wherein a preamble in the data packet comprises indication information of the different communications resources, and the indication information is used to indicate video service data carried on a corresponding communications resource, wherein that the pieces of video service data having different priorities are carried on different communications resources for transmission comprises: based on a correspondence between a communications resource and a priority of video service data, the pieces of video service data having different priorities are carried on different communications resources for transmission, wherein the correspondence between a communications resource and a priority of video service data is determined based on feedback information of the receive end; and the feedback information comprises a plurality of indication bits, one of the plurality of indication bits corresponds to one of a plurality of frequency bands, and the one indication bit is used to indicate a correspondence that is between an antenna and a priority of video service data and that is on the one frequency band; or the feedback information comprises one indication bit, and the indication bit is used to indicate a correspondence between an antenna and a priority of video service data.