The present disclosure provides a method of improving the energy consumption efficiency and a mobile terminal thereof, and a use of a thermo-electric conversion module. The method comprises the following steps: A. a power amplifier module electrically connected to a circuit board of the mobile terminal amplifies a communication signal of the mobile terminal to generate heat energy; B. a thermo-electric conversion module, of which an output terminal is electrically connected to the circuit board, absorbs the heat energy generated by the power amplifier module during operation; and C. the thermo-electric conversion module converts the heat energy absorbed into electric power and output the electric power to the circuit board. The thermo-electric conversion module is used in the mobile terminal to absorb heat energy generated during operation of the power amplifier and to convert the heat energy into electric power, so the energy consumption efficiency of the mobile terminal is improved; and meanwhile, this also
