The invention relates to a congestion control method for realizing reliable UDP transmission, belonging to an end-to-end control mechanism, which is as follow: the congestion control mechanism of end-to-end under the UDP protocol is realized with control strategy for receiving end and control strategy for sending end; when every four packets are received by the receiving end, an acknowledgement packet is sent, wherein, the information of network traffic is contained in the acknowledgement packet; based on the information contained in the acknowledgement packet, the time interval for sending the packets is adjusted by the sending end depending on the measured round trip time change of the packets, and the sending rate of packets is regulated; the congested network is recovered to unblock, and the bandwidth between both transmission sides is fully utilized. The invention has the advantages of efficient resource saving.