The invention relates to capacitance measurement circuit and method. The capacitance measurement circuit comprises a storage capacitor, a switching circuit, a voltage detector, a switching controller and a current source, wherein the switching circuit is coupled to the storage capacitor, a reference voltage and a voltage source; the voltage detector is coupled to the storage capacitor and used for detecting the voltage of the storage capacitor; the switching controller is coupled to the voltage detector and the switching circuit and used for controlling the switching circuit; and the current source is coupled to the switching circuit. The capacitance measurement method comprises the following steps of: precharging a storage capacitor; carrying out charge transfer on a capacitor to be measured and the storage capacitor; discharging and charging the storage capacitor according to the relationship between the voltage of the storage capacitor and a reference voltage; and measuring the capacitance of the capacitor to be measured according to the voltage of the storage capacitor.