An adapter module for a portable electronic device is disclosed. The adapter module is applied with a tablet electronic device. The adapter module includes an antenna unit, a first connection interface and a second connection interface. The first connection interface is configured for electrically connecting to the portable electronic device. The second connection interface is configured for electrically connecting to the tablet electronic device. When the first connection interface is electrically connected to the portable electronic device and the second connection interface is electrically connected to the tablet electronic device, the portable electronic device transmits a signal through the antenna unit of the adapter module, and the tablet electronic device displays an output information of the portable electronic device.