A data transmission method includes: acquiring n RLC PDUs transmitted from an RLC layer, n being an integer greater than 1; encapsulating the indication information corresponding to the n RLC PDUs as a packet header of a MAC PDU and the n RLC PDUs as a packet body of the MAC PDU, to generate the MAC PDU, the indication information corresponding to the n RLC PDUs comprising an LCID, a sequence number, and a length corresponding to each RLC PDU; and sending the MAC PDU to a communication peer.