Method and system for dynamically determining virtual network, and storage medium

Disclosed is a method for dynamically determining a virtual network, comprising: obtaining an access request message of a virtual network; according to source node and sink node information within the access request message, determining an abstract network topology structure of the virtual network requesting access; according to quality of service requirements information within the access request message and information of the abstract network topology structure, determining optimal virtual network information; when determined that the optimal virtual network information meets a preset condition, sending the optimal virtual network information so as to access an optimal virtual network. Also disclosed is a system for dynamically determining a virtual network.