The invention discloses a network function virtualization service chain mapping method under a ring network. The network function virtualization service chain mapping method under the ring network comprises the following steps: performing server group area pre-partitioning on virtual network functions of a service chain; allocating a server participating in resource allocation in the network function virtualization to the corresponding server group area; and selecting the corresponding virtual network functions on the corresponding server group area of each virtual network function in the service chain required by the user traffic for deployment when deploying the user traffic. The disclosure reasonably considers the resource capabilities of the CPU, memory, and bandwidth of each server ina ring networking mode, and implements efficient network function virtualization service chain resource mapping.