The present disclosure describes a sensitivity amplifier in the field of storage technology. The sensitivity amplifier includes: a first inverter, a second inverter, a first switch unit, a second switch unit, a third switch unit, a fourth switch unit, a fifth switch unit, the sixth switch unit, the seventh switch unit, and the eighth switch unit. The sensitivity amplifier can control the fifth switch unit, the sixth switch unit, the seventh switch unit, and the eighth switch unit to turn on or off, so that the sensitivity amplifier works in two different power rails, to achieve reduction of the static operating point deviation of the sensitivity amplifier during the noise cancellation stage.