The invention provides a high-fidelity link simulation method oriented to data packet forwarding. The method is implemented on the basis of an open cloud platform, and applied to a network simulationplatform. The method comprises the following steps: building an OpenStack cloud platform; constructing a link simulation interface program; constructing link simulation in hosts and cross the hosts according to whether a virtual network node is on the same computing node or not; calling a system kernel module to simulate link delay according to link delay simulation in the hosts; performing differential compensation on propagation delay of a data message in a physical link specific to the link delay simulation cross the hosts; calling a bandwidth limiting interface or adding into a virtual network card queue to configure a link bandwidth according to whether a virtualization technology carries a bandwidth limiting strategy or not; and calling the system kernel module to simulate link lossrate. Through adoption of the high-fidelity link simulation method, a flexible, transparent and realistic virtual link can be constructed in a virtual network, and quick configuration and automatic deployment of link performance parameters are supported.