A variable-frequency electric charge pump unit, a chip, and a communication terminal. The electric charge pump unit comprises a variable-frequency signal generator, an electric charge pump circuit, and a voltage detector connected in series. The variable-frequency signal generator outputs a clock signal for the electric charge pump circuit. The electric charge pump circuit generates an output voltage on the basis of the clock signal. The output voltage drives a load on the one hand and is connected to the voltage detector on the other hand. An output end of the voltage detector is connected to the variable-frequency signal generator. The working frequency of the variable-frequency signal generator can be adjusted dynamically on the basis of a requirement that a radiofrequency system work state has on the driving output of the electric charge pump unit, thus satisfying the actual demands for driving the load as required and reducing radiofrequency system noise interference.