A power control device and method, the method including obtaining, by a terminal device, class of device information of a peer device, determining, by the terminal device, based on the class of device information, a class of device of the peer device, and performing at least one of sending, by the terminal device, in response to the terminal device determining that the class of device of the peer device is a non-preset class of device, data to the peer device at a first transmit power, or sending, by the terminal device, data to the peer device at a second transmit power—in response to the terminal device determining that the class of device of the peer device is a preset class of device, —where the terminal device establishes a Bluetooth connection to the peer device, and the first transmit power is less than the second transmit power.