A pressure detection apparatus includes: a drive power supply, a differential circuit, a pressure calculation unit, and at least one pressure sensor. Each pressure sensor includes a first electrode plate, a second electrode plate, a third electrode plate, a first elastic dielectric layer, and a second elastic dielectric layer. One detection capacitor is formed between the first electrode plate and the second electrode plate, and one detection capacitor is formed between the first electrode plate and the third electrode plate. The pressure sensor is connected between the drive power supply and an input terminal of the differential circuit, and an output terminal of the differential circuit is connected to the pressure calculation unit.