The invention provides a low-dropout linear voltage regulator circuit. The circuit comprises a power supply end, an inner ring control module, an outer ring control module, a reference voltage end, a feedback module, an output end and an earthing end, wherein the inner ring control module and the feedback module form a quick access with high bandwidth and low gain; the outer ring control module and the feedback module form a slow access with high gain and low bandwidth; the outer ring control module comprises a first operational amplifier, a first field-effect transistor connected with the first operational amplifier, a capacitor connected with the first operational amplifier and the first field-effect transistor, as well as a first resistor connected with the first field-effect transistor; the inner ring control module comprises a second operational amplifier, as well as a second field-effect transistor connected with the second operational amplifier; and the feedback module comprises a second resistor, a third resistor connected with the second resistor, as well as a fourth resistor connected with the third resistor. The invention also provides a low-dropout linear voltage regulator system. The circuit and the system have high-accuracy output and can realize quick response.