An access device includes a Multi-protocol Label Switching (MPLS) connection management functional module for establishing a label connection and using the label connection for service transmission. The present invention also discloses a service transmission method, including establishing, in the access device, an external connection with the network side, and getting the received service mapped by the access device to the external label for transmission. A high bandwidth of the access device is ensured by utilizing a simple label switching principal in the MPLS protocol according to this invention; meanwhile, it is possible for the access device to support the access of multiple services, such as those of a Time Division Multiplexing (TDM), an Asynchronous Transfer Mode (ATM), a Fast Ethernet (FE) and an Asymmetric Digital Subscriber Line (ADSL), by utilizing the good service adaptability of the MPLS protocol to effectively increase the utilization rate of the network.