The present invention provides an ultrasound oral cavity tomography system, comprising a chin-supporting structure, a plurality of U-shaped ultrasound detectors, and an ultrasound examination unit. The chin-supporting structure is provided with a recess. Each of the U-shaped ultrasound detectors comprises a plurality of ultrasound probes arranged in a U-shaped array. The ultrasound examination unit is connected to the U-shaped ultrasound detectors and configured to form three-dimensional images of an oral cavity based on signals received by the U-shaped ultrasound detectors.
