Cross-data center RDMA network congestion control method and device based on near-end control

The invention provides a cross-data-center RDMA network congestion control method and device based on near-end control, and the method comprises the steps: generating a departure notification message through employing a preset congestion control algorithm when detecting that a data package transmitted to an upstream switch from an upstream data center is congested in the upstream switch in the data transmission of a cross-data-center network, and transmitting the departure notification message to the upstream switch; the upstream data center adjusts the sending rate according to the departure notification message; in the downstream data center, when it is detected that a data packet sent to the downstream data center by the downstream switch is congested, a preset congestion control algorithm is adopted to generate an arrival notification message, and the downstream switch adjusts the sending rate according to the arrival notification message; and in the downstream switch, a long-distance notification message