The invention discloses a noise reducing method for a capacitance detection signal processing circuit. A main operational amplifier is connected with the output terminal of the capacitance detection signal processing circuit, and an auxiliary operational amplifier is connected with the main operational amplifier in parallel, so as to reduce an input offset voltage Voffset of the whole operationalamplifier formed by the main operational amplifier and the auxiliary operational amplifier. The method disclosed by the invention can reduce a self noise of the circuit and also has relatively high antijamming capability. By adopting a CMOS integrated circuit technology, the size and power consumption of the circuit can be reduced.