DATA TRANSMISSION METHOD AND DEVICE

Embodiments of this application provide a data transmission method, and the method includes: receiving, by a receive end, at least two streams from a transmit end, where each of the at least two streams includes a plurality of data packets, each data packet carries a stream identifier of a stream to which the data packet belongs and a stream data sequence number, and the stream data sequence number indicates a sequence of the data packet in the stream to which the data packet belongs; for at least one of the at least two streams, determining, by the receive end, that a data packet whose stream data sequence number meets a sequential condition has been received; and submitting, by the receive end, the data packet whose stream data sequence number meets the sequential condition. In this way, sequential data packets in a stream can be directly submitted to an application layer, and submission of the sequential data packets in the stream is not affected by out-of-order at an entire connection layer, thereby effectively reducing head-of-line blocking and improving data transmission efficiency.