Abstract: This invention discloses a powerline apparatus, and the powerline apparatus includes a powerline network device, which connects with a computer system by a power outlet, and a data-powerline converter, which is connected with the computer system for converting the powerline signal to a network signal. The powerline network device uses a power transmission unit to supply the computer system with power, a signal-line set to transmit/receive the powerline signal to/from the data-powerline converter connected to the computer system, a transmission interface to connect the signal with the power line, and a coupling circuit to extract the powerline signal from/to the power line and couple to the data-powerline converter.