The present invention relates to a data transmission method and a communications device. The communications device includes: a memory, a processor, and a communications interface. The memory is configured to store mapping information between a data flow identifier and a physical layer transmission technology identifier. The processor is configured to: determine a to-be-scheduled data flow; determine, from the mapping information and according to a data flow identifier of the data flow, a physical layer transmission technology identifier corresponding to the data flow; generate, according to the data flow, a transport block which is corresponding to the physical layer transmission technology identifier; generate wireless communication data by performing processing, according to a physical layer transmission technology corresponding to the physical layer transmission technology identifier, on a transport block corresponding to the physical layer transmission technology identifier; and send the wireless communication data to a receive end by using the communications interface.