A circuit for capacitance detection, comprising: a control module, a driving module, an offsetting module, and a charge transfer module, the driving module being configured to positively charge a capacitor to be detected (Cx) through a first charging branch circuit; the offsetting module being configured to offset base capacitance of the capacitor to be detected (Cx) through a first offsetting branch circuit under the control of the control module; the driving module being configured to negatively charge the capacitor to be detected (Cx) through a second charging branch circuit under the control of the control module; the offsetting module being configured to offset the base capacitance of the capacitor to be detected (Cx) through a second offsetting branch circuit under the control of the control module; the charge transfer module being configured to transfer a charge on the capacitor to be detected (Cx) to generate an output voltage (Vout), the output voltage (Vout) being used to determine a capacitance variation of the capacitor to be detected (Cx) before and after the capacitor to be detected (Cx) is affected by an external electric field; wherein the offsetting module comprises a first offset resistor (R 1) and a second offset resistor (R 2), and wherein the control module is configured to: control the driving module to charge the capacitor to be detected (Cx) to a positive supply voltage through the first charging branch circuit; control, after the capacitor to be detected (Cx) is charged, the capacitor to be detected (Cx) to discharge toward a negative voltage source (Vss) through the first offset resistor (R 1), such that the base capacitance of the charged capacitor to be detected (Cx) is offset through the first offsetting branch circuit; control, after the base capacitance of the charged capacitor to be detected (Cx) is offset, the charge transfer module to transfer a charge on the capacitor to be detected (Cx) to generate the output voltage; control, after the charge on the capacitor to be detected (Cx) is transferred, the driving module to charge the capacitor to be detected (Cx) to a negative supply voltage through the second charging branch circuit; control, after the capacitor to be detected (Cx) is charged, the capacitor to be detected (Cx) to discharge toward a positive voltage source (Vcc) through the second offset resistor (R 2), such that the base capacitance of the charged capacitor to be detected (Cx) is offset through the second offsetting branch circuit; control, after the base capacitance of the charged capacitor to be detected (Cx) is offset, the charge transfer module to transfer a charge on the capacitor to be detected (Cx) to generate the output voltage. control the driving module to charge the capacitor to be detected (Cx) to a positive supply voltage through the first charging branch circuit; control, after the capacitor to be detected (Cx) is charged, the capacitor to be detected (Cx) to discharge toward a negative voltage source (Vss) through the first offset resistor (R 1), such that the base capacitance of the charged capacitor to be detected (Cx) is offset through the first offsetting branch circuit; control, after the base capacitance of the charged capacitor to be detected (Cx) is offset, the charge transfer module to transfer a charge on the capacitor to be detected (Cx) to generate the output voltage; control, after the charge on the capacitor to be detected (Cx) is transferred, the driving module to charge the capacitor to be detected (Cx) to a negative supply voltage through the second charging branch circuit; control, after the capacitor to be detected (Cx) is charged, the capacitor to be detected (Cx) to discharge toward a positive voltage source (Vcc) through the second offset resistor (R 2), such that the base capacitance of the charged capacitor to be detected (Cx) is offset through the second offsetting branch circuit; control, after the base capacitance of the charged capacitor to be detected (Cx) is offset, the charge transfer module to transfer a charge on the capacitor to be detected (Cx) to generate the output voltage.