A power control device for improving a switch spectrum of a radio frequency power amplifier, comprising: a linear voltage regulator circuit and a dynamic current source, wherein the linear voltage regulator circuit further comprises an error amplifier, a feedback circuit and a flow-through element, wherein an inverting terminal of the error amplifier is configured to be connected to a power control signal (Vramp) provided externally, an non-inverting terminal is connected to one terminal of the feedback circuit, and an output terminal is connected to a gate electrode of the flow-through element; a source electrode of the flow-through element is connected to a power supply terminal (Vdd), and a drain electrode is connected to the other terminal of the feedback circuit; the other terminal of the feedback circuit is connected to a drain electrode of the flow-through element; the dynamic current source comprises three terminals, wherein a first terminal is connected to the output terminal of the error amplifier, a second terminal is connected to the non-inverting terminal of the error amplifier, and a third terminal is connected to the drain electrode of the flow-through element; the power control device being characterised in that the dynamic current source is constituted by a PMOS transistor and an NMOS transistor; a gate electrode of the PMOS transistor is connected to the output terminal of the error amplifier, a drain electrode is connected to the non-inverting terminal of the error amplifier, and a source electrode is connected to the drain electrode of the flow-through element; a gate electrode and a source electrode of the NMOS transistor are connected to each other, and are further connected to the drain electrode of the flow-through element, and a drain electrode of the NMOS transistor is connected to the non-inverting terminal of the error amplifier; when the power control signal (Vramp) gradually increases to be higher than a set value or the supply voltage (Vdd) is decreased to the set value, that is, when the gate electrode of the flow-through element is decreased to the set value, the dynamic current source is conducted to work. the dynamic current source comprises three terminals, wherein a first terminal is connected to the output terminal of the error amplifier, a second terminal is connected to the non-inverting terminal of the error amplifier, and a third terminal is connected to the drain electrode of the flow-through element; the power control device being characterised in that the dynamic current source is constituted by a PMOS transistor and an NMOS transistor; a gate electrode of the PMOS transistor is connected to the output terminal of the error amplifier, a drain electrode is connected to the non-inverting terminal of the error amplifier, and a source electrode is connected to the drain electrode of the flow-through element; a gate electrode and a source electrode of the NMOS transistor are connected to each other, and are further connected to the drain electrode of the flow-through element, and a drain electrode of the NMOS transistor is connected to the non-inverting terminal of the error amplifier; when the power control signal (Vramp) gradually increases to be higher than a set value or the supply voltage (Vdd) is decreased to the set value, that is, when the gate electrode of the flow-through element is decreased to the set value, the dynamic current source is conducted to work.