The invention relates to a voltage regulator achieving the rapid transient response and low pressure difference, and relates to the field of analogue integrated circuits. The voltage regulator comprises an error amplifier, a power tube Mp and a feedback sampling resistor; the voltage regulator is characterized by further comprising a buffer, a PNP transistor and an NPN transistor, an output end of the error amplifier is connected with a base electrode of the PNP transistor, and an emitter of the PNP transistor is connected with an output end of the voltage regulator; a collector and a base electrode of the NPN transistor are connected with a collector of the PNP transistor, an emitter of the NPN transistor is grounded, and a base electrode of the NPN transistor is connected with a first input end of the buffer; an output end of the buffer is connected with a grid electrode of the power tube; an input end of the power tube is connected with input voltage, and an output end of the power tube is connected with the emitter of the PNP transistor; the emitter of the PNP transistor is grounded through a first feedback sampling resistor and a second feedback sampling resistor which are connected in series, and the connection point of the first feedback sampling resistor and the second feedback sampling resistor is connected with a reverse input end of the error amplifier. Accordingly, on the condition that additional static power consumption does not need to be added, system loop delay is reduced, and the rapid transient response is achieved.