Maxillofacial pain evaluation method and device applied to mechanical stimulation and medium

The invention discloses a mechanical stimulation maxillofacial region pain evaluation method and device and a medium, and the method comprises the steps: obtaining facial features before and after spontaneous pain of a target maxillofacial region, and the facial features comprise eye features, nose features and mouth features; according to the eye features, the nose features and the mouth features before and after the target maxillofacial region spontaneous pain, calculating eye change features, nose change features and mouth change features; and determining a pain threshold according to the eye change characteristics, the nose change characteristics and the mouth change characteristics. Based on an image processing technology, eye, nose and mouth features before and after spontaneous pain of a target maxillofacial region of an animal are extracted, changes of the features before and after spontaneous pain of the maxillofacial region are calculated, the pain threshold is evaluated according to the change feat