The invention discloses a power supply regulator and a radio frequency front end module. The power supply regulator comprises a control module and a voltage stabilizing module. The first signal output end of the control module is electrically connected with the first signal input end of the voltage stabilizing module. The second signal output end of the control module is electrically connected with the second signal input end of the voltage stabilizing module. The control module is obtained on the basis of the HEMT process and comprises a control unit and an image current unit. The voltage stabilizing module is obtained on the basis of the HBT process. The power supply regulator can generate output voltage which is not changed together with drive voltage, the working state of the power supply regulator can be controlled according to external enable signals, and the aims of providing stable output voltage in the radio frequency front end module obtained on the basis of the HBT process and the HEMT process and cutting off output voltage in the idle state are achieved.