The present invention provides a method for a virtual private cloud to access a network, a network side device and a data center device. When receiving a VPC configuration resource provided by a user, the network side device and the data center device exchange information, create a VPC, determine a PE interface address, a VCE uplink port address, an access tunnel and a VCE downlink port address for the VPC, and perform a corresponding configuration operation, thereby enabling the VPC to access a VPN in a basic bearer network without the need of uniform management of a control system, so as to solve a problem that the VPC cannot access the network when the basic bearer network and a data center belong to different operators, and meanwhile, save a device resource.