A method for regulating a voltage of a power amplifier, applied to multi-standard base stations and comprising following steps of: acquiring an average power and a peak-to-average power ratio of a transmitting signal; acquiring a peak power of the transmitting signal according to the average power and the peak-to-average power ratio; and regulating an operating voltage of the power amplifier according to the peak power and a saturation power of the power amplifier, characterized in that, wherein the step of regulating an operating voltage of the power amplifier according to the peak power and a saturation power of the power amplifier comprises: when the peak power is greater than a maximum power in a power range corresponding to a current operating voltage of the power amplifier, acquiring a target operating voltage of the power amplifier according to the peak power and the saturation power of the power amplifier, and increasing the operating voltage of the power amplifier according to the target operating voltage; and when the peak power is less than a minimum power in the power range corresponding to the current operating voltage of the power amplifier, acquiring the target operating voltage of the power amplifier according to the peak power and the saturation power of the power amplifier, and decreasing the operating voltage of the power amplifier according to the target operating voltage. acquiring an average power and a peak-to-average power ratio of a transmitting signal; acquiring a peak power of the transmitting signal according to the average power and the peak-to-average power ratio; and regulating an operating voltage of the power amplifier according to the peak power and a saturation power of the power amplifier, characterized in that, wherein the step of regulating an operating voltage of the power amplifier according to the peak power and a saturation power of the power amplifier comprises: when the peak power is greater than a maximum power in a power range corresponding to a current operating voltage of the power amplifier, acquiring a target operating voltage of the power amplifier according to the peak power and the saturation power of the power amplifier, and increasing the operating voltage of the power amplifier according to the target operating voltage; and when the peak power is less than a minimum power in the power range corresponding to the current operating voltage of the power amplifier, acquiring the target operating voltage of the power amplifier according to the peak power and the saturation power of the power amplifier, and decreasing the operating voltage of the power amplifier according to the target operating voltage. when the peak power is greater than a maximum power in a power range corresponding to a current operating voltage of the power amplifier, acquiring a target operating voltage of the power amplifier according to the peak power and the saturation power of the power amplifier, and increasing the operating voltage of the power amplifier according to the target operating voltage; and when the peak power is less than a minimum power in the power range corresponding to the current operating voltage of the power amplifier, acquiring the target operating voltage of the power amplifier according to the peak power and the saturation power of the power amplifier, and decreasing the operating voltage of the power amplifier according to the target operating voltage.