The invention discloses a voltage buffer circuit and a low dropout regulator (LDO) integrated with the voltage buffer circuit. The buffer circuit comprises a first metal oxide semiconductor (MOS) transistor, a second MOS transistor, a third MOS transistor, a fourth MOS transistor, a first resistor unit, a second resistor unit, a capacitor element and a current source. The LDO of the voltage buffer circuit is integrated, the circuit stability is ensured at high-power tube gate parasitic poles, the current pull-down capacity of the power tube gate is improved, and the undershoot peak from light load to heavy load is reduced; due to the action of an RC high-pass coupling circuit in the buffer circuit, when the operating frequency of the circuit is near the filter cut-off frequency, the charging current of the power tube gate is increased, the overshoot peak from heavy load to light load is reduced, push-pull output is formed under the condition that the quiescent dissipation is not obviously increased, and the transient response of the LDO circuit is improved; and meanwhile, the LDO integrated with the voltage buffer circuit is simple in structure, and the chip area is saved.