A capacitive fingerprint sensor, comprising: a target electrode, a sensing electrode, a driving electrode, a first level driver, a second level driver, a first initialization switch, a first reference level, an integrating capacitor, a second initialization switch, a second reference level, a charge transfer switch, a comparator and a third reference level, wherein: the sensing electrode comprises one or more sensing electrodes, and is connected to a first port of the first initialization switch and a first port of the charge transfer switch; the target electrode is a surface of a target to be measured, is connected to the first level driver and is positioned above the sensing electrode, wherein a target capacitance is formed between the target electrode and the sensing electrode; the driving electrode comprises one or more driving electrodes, is connected to the second level driver and is positioned below the sensing electrode, wherein a dielectric layer is formed between the driving electrode and the sensing electrode, and a driving capacitance is formed between the driving electrode and the sensing electrode; the first level driver is connected to a first level control signal and the target electrode; the second level driver is connected to a second level control signal and the driving electrode; the first port of the first initialization switch is connected to the sensing electrode, and a second port of the first initialization switch to the first reference level; the first reference level is connected to the second port of the first initialization switch; the integrating capacitor comprises one capacitor or a plurality of capacitors connected in parallel, and is connected to a first port of the second initialization switch, a second port of the charge transfer switch and a first input terminal of a comparator; the first port of the second initialization switch is connected to the integrating capacitor, and a second port of the second initialization switch to the second reference level; the second reference level is connected to the second port of the second initialization switch; the first port of the charge transfer switch is connected to the sensing electrode, and the second port of the charge transfer switch to the integrating capacitor; wherein the first level driver outputs the level V11 to a capacitor when the first level control signal is low, and outputs the level V12 to the capacitor when the first level control signal is high, and AC components of the level V11 and the level V12 are inversely coupled to the target electrode; and the first input terminal of the comparator is connected to the integrating capacitor, a second input terminal of the comparator to the third reference level, and an output terminal of the comparator is an output terminal of the sensor. the sensing electrode comprises one or more sensing electrodes, and is connected to a first port of the first initialization switch and a first port of the charge transfer switch; the target electrode is a surface of a target to be measured, is connected to the first level driver and is positioned above the sensing electrode, wherein a target capacitance is formed between the target electrode and the sensing electrode; the driving electrode comprises one or more driving electrodes, is connected to the second level driver and is positioned below the sensing electrode, wherein a dielectric layer is formed between the driving electrode and the sensing electrode, and a driving capacitance is formed between the driving electrode and the sensing electrode; the first level driver is connected to a first level control signal and the target electrode; the second level driver is connected to a second level control signal and the driving electrode; the first port of the first initialization switch is connected to the sensing electrode, and a second port of the first initialization switch to the first reference level; the first reference level is connected to the second port of the first initialization switch; the integrating capacitor comprises one capacitor or a plurality of capacitors connected in parallel, and is connected to a first port of the second initialization switch, a second port of the charge transfer switch and a first input terminal of a comparator; the first port of the second initialization switch is connected to the integrating capacitor, and a second port of the second initialization switch to the second reference level; the second reference level is connected to the second port of the second initialization switch; the first port of the charge transfer switch is connected to the sensing electrode, and the second port of the charge transfer switch to the integrating capacitor; wherein the first level driver outputs the level V11 to a capacitor when the first level control signal is low, and outputs the level V12 to the capacitor when the first level control signal is high, and AC components of the level V11 and the level V12 are inversely coupled to the target electrode; and the first input terminal of the comparator is connected to the integrating capacitor, a second input terminal of the comparator to the third reference level, and an output terminal of the comparator is an output terminal of the sensor.