The present disclosure provides a differential circuit, a capacitance detection circuit and a touch detection apparatus, which can reduce a noise of the differential circuit and improve a signal-to-noise ratio of an output signal. When the differential circuit is applied in a capacitance detection circuit, accuracy of capacitance detection can be improved. The differential circuit includes a front-end circuit and a processing circuit, where the front-end circuit includes a control circuit and a (PGA) circuit. The control circuit is connected to a power supply, two capacitors and a (PGA) circuit and configured to: control, at a first stage, the power supply to charge the two capacitors and control the two capacitors to discharge to the (PGA) circuit; and control, at a second stage, the (PGA) circuit to charge the two capacitors. The (PGA) circuit is configured to convert capacitance signals of the two capacitors into voltage signals at the first stage and the second stage respectively, and perform a difference operation to obtain differential signals of voltages corresponding to the two capacitors at the first stage and at the second stage. The processing circuit is connected to the front-end circuit and is configured to determine, according to the differential signals output by the front-end circuit at the first stage and the second stage, a target differential signal of voltages corresponding to the two capacitors.
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