The invention provides a capacitive accelerometer, comprising a substrate, a mass detection block, and at least a support base. The support base is fixed on the substrate. The mass detection block is suspended on the surface of the support base in an asymmetrical manner through springs which are arranged oppositely. The substrate is provided with at least two electrodes which are opposite to each other. The electrodes are respectively corresponding to the side of the mass detection block where the mass is relatively large and the side where mass is relatively low. The electrodes are used to form a capacitor with the mass detection block. The support base is provided with a support center. The electrode is provided with an electrode center. The support center is overlapped with the electrode center. The mean distance from the support base to the support center is equal to or approximately equal to the mean distance from the electrode to the electrode center. The capacitive accelerometer is advantaged in that the mean distance from the support base to the support center is equal to the mean distance from the electrode to the electrode center, so electrode clearance changes are reduced, and sensitivity changes are reduced, and the sensitivity is more stable.