The present invention relates to a power amplifying circuit of a mobile terminal and, more particularly, to a voltage gain control circuit in a mobile terminal which is capable of acquiring a variable voltage gain. The present invention includes a transceiver controller to produce a voltage gain control signal and transforming analog and digital signals; a first driving voltage controller for generating a reference voltage for a predetermined voltage gain according to the voltage gain control signal; a DC voltage transformer for transforming source voltage into a first driving voltage according to the reference voltage of the first driving voltage controller; a second driving voltage controller for generating a second driving voltage according to the voltage gain control signal; and a power amplifier for generating a predetermined voltage gain according to the first driving voltage supplied by the DC voltage transformer and the second driving voltage supplied by the second driving voltage controller.