Embodiments of the present invention provide a packet retransmission method and apparatus, where the method includes: sending, by a transmit end, a first packet to a receive end by using a first path, where the first path is a path on a Transmission Control Protocol TCP data connection; receiving a response message by using a second path, where the response message is used to indicate that the receive end does not receive the first packet, and the response message includes an indication field, where the indication field is used to indicate that a packet is transmitted on the second path; and resending the first packet to the receive end by using the second path, where the resent first packet includes the indication field.