A method based on a TS format and a UDP transmission mode for retransmitting a lost network packet, comprising the following steps: S1: receiving, by a media terminal, TS-format media packets sent by a media server by means of UDP; S2: checking the continuity of CC fields of the TS-format media packets every time the media terminal receives a batch of TS-format media packets, and proceeding to the next step if the CC fields are discontinuous, which means that packet loss has occurred to the TS-format media packets sent by the media server by means of UDP; S3: sending, by the media terminal, a retransmission request packet to a media retransmission server by means of UDP, and analyzing the retransmission request packet by the media retransmission server to obtain a TS-format media packet that is missing from the media terminal, characterized in that: wherein the retransmission request packet comprises: part or all of content of the TS-format media packets received by the media terminal, and each of the CC fields of the TS-format media packets received by the media terminal; and wherein the media retransmission server determines, based on the content and the CC fields in the retransmission request packet, the TS-format media packet that is missing from the media terminal; and S4: packing, by the media retransmission server, the TS-format media packet that is missing from the media terminal into a retransmission response packet by means of UDP and sending, by the media retransmission server, the retransmission response packet to the media terminal. S1: receiving, by a media terminal, TS-format media packets sent by a media server by means of UDP; S2: checking the continuity of CC fields of the TS-format media packets every time the media terminal receives a batch of TS-format media packets, and proceeding to the next step if the CC fields are discontinuous, which means that packet loss has occurred to the TS-format media packets sent by the media server by means of UDP; S3: sending, by the media terminal, a retransmission request packet to a media retransmission server by means of UDP, and analyzing the retransmission request packet by the media retransmission server to obtain a TS-format media packet that is missing from the media terminal, characterized in that: wherein the retransmission request packet comprises: part or all of content of the TS-format media packets received by the media terminal, and each of the CC fields of the TS-format media packets received by the media terminal; and wherein the media retransmission server determines, based on the content and the CC fields in the retransmission request packet, the TS-format media packet that is missing from the media terminal; and wherein the retransmission request packet comprises: part or all of content of the TS-format media packets received by the media terminal, and each of the CC fields of the TS-format media packets received by the media terminal; and wherein the media retransmission server determines, based on the content and the CC fields in the retransmission request packet, the TS-format media packet that is missing from the media terminal; and S4: packing, by the media retransmission server, the TS-format media packet that is missing from the media terminal into a retransmission response packet by means of UDP and sending, by the media retransmission server, the retransmission response packet to the media terminal.