The invention discloses an LDO circuit with fast response. The circuit comprises a bandgap reference circuit, an error amplifier, a Class AB driver circuit, a power tube, a response circuit, a first resistor and a second resistor; the output end of the bandgap reference circuit is connected with the first input end of the error amplifier, and the first output end and the second output end of the error amplifier are connected with the first input end and the second input end of the Class AB driver circuit respectively; the output end of the Class AB driver circuit is connected with the control end of the power tube; the first ends of the power tube are connected with a power supply, and the second end of the power tube is connected with the ground through the first resistor and the second resistor; a connection node between the first resistor and the second resistor is connected with the second input end of the error amplifier; the feedback end of the response circuit is connected with the second end of the power tube, and both output ends of the response circuit are connected with the first input end and the second input end of the Class AB driver circuit respectively. By means of the circuit, the adjustment speed and the response speed of a loop can be increased, and output voltage fluctuation is reduced.