Abstract: A mobile communication device and a wireless communication signal adjusting method thereof are disclosed. The mobile communication device includes an antenna module, a wireless signal processing module, a sensor module, and a first adjust module. The antenna module is used for transferring the wireless communication signal. The wireless signal processing module is electrically connected to the antenna module via a first match circuit, and used for receiving or transmitting the wireless communication signal. The sensor module is used for sensing a position of a human body, and generating a high voltage signal when the human body is approaching. When the sensor module generates the high voltage signal, the first adjust module is used for controlling the antenna module to further electrically connect a second match circuit and changing a frequency response to reduce the energy of the wireless communication signal.