The invention discloses a private wire network access method and system, and relates to the technical field of communication. The problem of relatively complex configuration operation caused by manual configuration of corresponding configuration parameters in a core gateway can be solved. The method comprises the following steps: sending private wire network access information to a core gateway controller through a user information manager, wherein the private wire network access information is information used for establishing a virtual extended local area network vxlan tunnel between the core gateway and a user side gateway; generating a configuration instruction by the core gateway controller according to the private wire network access information, wherein the configuration instruction is an instruction used for establishing the vxlan tunnel; sending the configuration instruction to the core gateway by the core gateway controller; and establishing the vxlan tunnel with the user side gateway by the core gateway according to the configuration instruction, so that a terminal accesses a private wire network through the user side gateway and the core gateway. The scheme provided by the invention is suitable for the terminal to access the private wire network.