Cloud computing and virtualization technologies are developing rapidly in the computer field. Docker container technology has become the focus of the research direction. As the traffic load of cloud data center changes at any time, network congestion may frequently occur, resulting in network equipment resource tension, and the decline of application throughput, increase of packet loss and delay, affecting the communication performance and the quality of the entire cloud platform server. Aiming at these problems, this paper improves the network congestion by transferring the Docker container mounted on the physical machine, and a network-aware Docker container rescheduling algorithm is proposed to improve the communication capability of the physical machine to improve the global communication efficiency. The algorithm improves the communication capability between physical machines by migrating fewer virtual machines to improve the overall communication performance of the entire data center.