The invention discloses a power switching device of a communication device and a method thereof. The device comprises a detection module, a pulldown module, a radio frequency module, a test base and an antenna module; the detection module judges a current work mode according to the switch-on and switch-off of a test base and the pulldown state of the pulldown module and invokes corresponding parameters to configure the radio frequency module according to the corresponding work mode; the radio frequency module sends out a corresponding power according to the corresponding parameters; the corresponding power controls the antenna module to receive and transmit signals; therefore, the signals are sent and transmitted through selecting the corresponding power according to the work mode; the performance of the communication device is improved; and the existing problem that the conductive test power and radiation power are the same, whether each index actually reaches the standard or not cannot be judged, and the performance of the communication device is influenced is solved.